How Long Weed Seeds Last In Body

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How long does weed stay in your system and how long does THC stay in your system? Find out all you need to know about THC tests How long marijuana stays in your body depends on many different things. Learn more about these factors, marijuana drug testing and detoxing from weed. How long weed will stay in your system depends on a range of factors such as frequency of use, your individual metabolic rate and body fat percentage

How long does THC stay in your system?

How long does weed stay in your system? THC is detectable in bodily fluids, such as urine, for 30 days or more. It can remain for up to 90 days in the heaviest users. The heavier and more frequent users will retain traces of weed and THC for longer. Lighter cannabis users will retain traces of THC for shorter periods.

Generally speaking, detection time is easiest in human hair. A hair test can indicate cannabis use even if the hair test happened several months after the cannabis was consumed. In addition to hair testing, THC is also detectable in urine, sweat, oral fluid, and blood tests.

Summary:
How does the detection of THC in your system work?
How long does THC stay in your system chart
How long does weed stay in your system and what that means for drug tests
Key factors that influence the detection of THC and how long THC stays in your system
How long does THC stay in your system for different consumption methods?
THC stays in your system longer than hard drugs
How long does THC stay in your system for driving?
Can other cannabinoids than THC show on a drug test?
How to get THC out of your body faster

How does the detection of THC in your system work?

The misguided war on cannabis has empowered many managers to test their staff for weed use. Many types of THC testing are at their disposal. Below are a few, alongside some technical information about their effectiveness.

Blood testing for cannabis use/THC

How long does THC stay in your blood system? Between 2 and 7 days according to this study of 25 heavy cannabis users. Only blood tests from the heaviest long term cannabis users showed the presence of THC after 7 days.

Urine testing for THC and weed use

How long does THC stay in your system with a urine test? A single use of cannabis could be detected in a urine test 2-7 days after the event. But studies indicate that heavy cannabis users could give positive urine tests up to 2 months later. The limit is thought to be around 3 months. THC is stored as a metabolite (known as ‘THC-COOH’) by the body in fat cells after use. It is slowly released by the fat cells in a way that urine tests can easily show. That’s the reason why skinnier people with lower fat deposits are more likely to pass THC urine tests earlier than they would if they had significant fatty tissue deposits.

Saliva tests for THC/cannabis use

How long does THC stay in saliva? According to studies, about 2-3 days for an occasional user, up to a month for regular heavy users.

As with blood and urine tests, the following basic rules apply. How recently you last used cannabis will affect the result, the more recent the use the greater the chance of a positive result. Likewise consumption plays an important role, the more you vaped/smoked, the greater the chances that the test will detect it.

Note that the saliva test doesn’t look for THC metabolites (products formed from the break-down of THC). Instead the saliva test just looks for the presence of pure THC in your saliva. Good oral hygiene, and the use of dilution tactics (where possible) are the best approach for beating a saliva test.

Hair testing for THC and cannabis use

How long does THC stay in hair? According to scientific studies,90+ days. The hair follicles are supplied with blood. This carries the tell-tale signals of cannabis. The cannabis metabolic residues are locked into the hair tissue where they remain detectable several months after consumption. Human hair grows at just over 1cm per month, so anyone with just 3-4cm of hair would be testable for cannabis use over the previous 3 months.

How long does THC stay in your system chart

How long does THC really stay in your system? The answer depends on a few factors, including the test method. The amount of cannabis you use and the frequency of use can all play a part. As can the individual amount of body fat. The chart, below, shows what you can expect.

How long does weed stay in your system and what does that mean for drug tests?

A whole industry has grown up catering for people trying to pass drug tests. Everything from synthetic urine with a fake penis delivery system, to dietary supplements have been used. Much of the time, efforts to evade THC detection work on the theory of dilution. Basic urine checks are fooled if the user has consumed large quantities of water prior to the test. But advanced urine tests can check to see if the sample is over-diluted and reject it.

Other drug test evasion techniques require you to add small amounts of chemicals such as vinegar, baking soda or lemon juice to the urine sample. These are scientifically proven ways to cheat a test. They will interfere with the chemical reaction used in the THC test. But again, more advanced urine test techniques can trace for the presence of deliberate contamination and reject the sample.

If your urine test isn’t being supervised, you can simply provide urine from a non-cannabis using friend/relative or buy some powdered THC-free synthetic urine. If you are facing the possibility of being tested for weed use it helps to know more about how long weed really does stay in your system.

Key factors that influence the detection of THC and how long THC stays in your system

Several variables can affect how long weed stays in your system. These include your age, your cannabis consumption pattern and body mass index (BMI). These all have an impact on how your body processes and uses cannabis.

Other considerations include the type/potency of cannabis you use as well as how you use it. A heavy dose of cannabis that you have eaten (edibles) can be detected for longer than a one-off light vape. The amount and the frequency that you use weed will also affect how long THC stays in your system. If you use high quality, THC rich weed regularly, your body fats and bodily fluids will have easily detectable THC levels for longer periods than a user of lower doses of weaker weed.

How long THC stays in your system for different people (sex, age, fitness, hydration, metabolism. )

There are many questions related to how long THC stays in your system. In reality, the answer is different for each of us.

‘How long does THC stay in your system if you’re a skinny guy?’ will have a different answer compared to ‘how long does THC stay in your system if you’re overweight?’. Note that THC metabolites (THC-COOH) are stored in fatty tissues. Those with lower fatty tissue deposits, on average, have lower THC storage than those with higher levels of fatty deposits.

How long does weed stay in the system of an athlete? Usually less time than for an average person. That’s because athletes tend to have the lowest levels of fatty tissue deposits. In addition, higher metabolic rates in athletes may lend themselves to faster breakdown of THC.

How long does THC stay in your system as a vegan? Much would depend on the individual, their levels of fatty tissue, their cannabis usage habits etc. Simply having a meat-free diet doesn’t mean that THC leaves your system any quicker than it would for a meat eater.

Even the question ‘how long does THC stay in your system if you’re a daily user?’ is difficult to give a definitive answer to. Some daily users smoke weed all day every day, others will only have a small daily vape in the evening to help them sleep.

Many have asked ‘how long does THC stay in your system?’ and if a calculator can determine the precise answer for their specific size, usage etc. But without detailed metabolic studies and fatty tissue analysis on each individual it’s impossible to create a calculator that will provide an accurate answer.

Maintaining good levels of bodily hydration is a key part of good health. But for cannabis users concerned about possible THC testing, good hydration is especially important since many of the ways used to defeat lower-tech THC tests require plenty of hydration to dilute the THC levels below detection limits.

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Since CBD isn’t psychoactive, few people worry about how long CBD stays in your system. Drug test companies, so far, haven’t made it a priority to catch CBD users.

How long does THC stay in your system for different consumption methods?

For any cannabis user facing a potential THC test, knowing roughly how long THC stays in your system is important. But does the way you consume THC affect how long THC really stays in your system?

‘How long does THC oil stay in your system?’ and ‘how long do THC edibles stay in your system’ may well have a different answer to the question of ‘how long does THC stay in your system after one puff’. A single inhalation of a vape or joint may just give you a few (e.g. 10) mg of THC. This is quicker for the body to metabolise than someone who took a 500mg THC edible or a gram of cannabis oil. No matter whether you enjoy your THC in gummies, wax pen, concentrates or dabs the THC will stay in your system. How quickly it disappears depends on you, your THC usage, metabolic rate, fatty tissue deposits and recent cannabis consumption habits.

THC stays in your system longer than hard drugs

One great irony of cannabis use is that, despite it being the least harmful of all recreational drugs, it remains the easiest to detect. That has led to years of unfair targeting of cannabis users. Many hard drugs have no medical benefits (in contrast to cannabis), yet are much more difficult to detect. This means that cannabis users have always been the easiest of all drug users to target, even though responsible adult use of cannabis is the least pressing ‘drugs problem’. Many would argue that truly responsible cannabis use is neither a drug problem nor the business of anyone else.

Frequency of use and cannabis dosage

Most cannabis users have different usage levels. This greatly complicates the simple question of how long does THC stay in your system. Daily cannabis users can have radically different cannabis consumption rates even though they may be all classified, rather alarmingly, as ‘chronic users’. A pensioner that uses a small pinch of weed each night in a vaporiser to assist sleep will have substantially lower THC levels in their system compared to a medical cannabis user that smokes heavily and regularly throughout the day.

Drug test sensitivity / accuracy

Drug tests from different suppliers all have different levels of sensitivity. The most advanced THC urine tests can measure other chemicals in urine to assess whether the user has recently consumed ‘excessive’ levels of water. ‘Dilution’ is the most common way to defeat lower tech urine tests, though it can be useless against higher tech THC urine tests.

This makes it difficult for the average cannabis consumer to be able to anticipate which type of test they will face, and how best to defeat it.

Many of those employed by the certain Government departments face regular THC testing. One of the favoured options to defeat THC urine tests is the ‘Whizzinator’. This is a false penis kept in your underwear for any urine test where you will be watched as you give the sample. The Whizzinator silently produces a perfectly safe ‘urine’ sample and even comes in different skin colours to defeat the most over-zealous drug testers that may be monitoring you.

How long does THC stay in your system for driving?

Drug driving is something that many cannabis users are very aware of. That’s one reason why regular cannabis users tend to show extra diligence and care when driving. After all, no-one wants to be involved in a road traffic accident which wasn’t their fault, only to lose their license because the THC test found traces of a joint they enjoyed a few days previously.

THC impaired driving is a controversial subject. Especially because studies have shown conflicting results about THC and road safety. Combined with this is the fact that it is scientifically difficult to show that, at the time of the accident, the driver was impaired by the psychoactive effects of THC.

Presence of THC may be detectable a month or two after the person last used cannabis, but this doesn’t mean that their driving ability was still impaired weeks later. That hasn’t stopped countries like Germany imposing draconian drug driving laws with a zero tolerance to THC. In Germany, just 1 nanogram of THC per ml of blood is sufficient to get you in serious trouble. The wiki page on THC and driving impairment is essential reading and shows a messy range of approaches and laws which have evolved around the world.

Of course, the responsible cannabis user tends to relax at home with a joint rather than drive around town smoking one whilst breaking speed limits and driving disrespectfully in full view of bored traffic cops. But being caught accidentally and being banned from driving remains a real fear for many regular cannabis users.

Can other cannabinoids than THC show on a drug test?

No, usually the chemists at the drug test companies focus their efforts on detecting THC and its metabolites.

How to get THC out of your body faster?

Unfortunately if you are facing an imminent drugs tests there is no simple, effective and 100% foolproof way to get THC out of your body faster. Because THC and its metabolites are stored in fatty tissues, removal of it is regarded as a process rather than an event.

How Long Does Weed Stay in Your System?

Marijuana, sometimes referred to as weed, pot, dope, Mary Jane or cannabis, is the most commonly used federally illegal drug in the United States, with an estimated 48.2 million people using it in 2019. Marijuana refers to the dried flowers, leaves, stems and seeds of the cannabis plant and contains hundreds of compounds (often called cannabinoids). These compounds contain both tetrahydrocannabinol (THC), which is impairing or “mind-altering,” and cannabidiol (CBD), which is not impairing and does not cause a “high.”

Like many drugs, there are a variety of factors that can affect how long marijuana is detectable. How often a person uses marijuana, the THC content, body fat, genetics, how the drug test is measured (blood, urine, saliva, etc.) and many other factors can determine how long marijuana remains in a person’s system.

What Happens When You Consume Weed?

The effects of marijuana can vary from person to person — some feeling relaxed or euphoric, while others can feel anxious and paranoid. This can depend on a number of characteristics like genetics, body fat, THC content and how marijuana is ingested (smoking or eating). After smoking marijuana, THC rapidly enters the bloodstream, where it can make you feel “high.” If marijuana is ingested orally, usually as edibles, it takes longer to be absorbed into the blood and can range from about 20 minutes to an hour and a half.

Weed Side Effects

Short-term effects of consuming marijuana (memory, problem-solving, coordination and driving impairment) are more pronounced in the first hour or two but can last for up to 24 hours. Because there is so much variation between strains of marijuana, other effects can be varied.

Other effects can include:

  • Dry mouth
  • Swollen eyelids
  • Increased appetite (“the munchies”)
  • Relaxation
  • Stimulation
  • Distorted perception
  • Loss of coordination
  • Trouble with thinking, memory and problem solving
  • Increased heart rate

How Is Weed Processed by the Body?

THC is a sticky, easily vaporized compound that readily dissolves into fats. Once in the body, it is deposited into fatty (adipose) tissue like the liver, lungs and spleen. THC is metabolized by the liver to 11-OH-THC and then further metabolized to an inactive compound (THCCOOH). There are two enzymes responsible for this metabolism, and there can be genetic variation in these — meaning some people may metabolize marijuana quickly and others will metabolize it slowly.

Factors Determining How Long Weed Stays in Your System

Many factors can affect the amount of time that marijuana remains in the body after consuming it. The effects of marijuana can be felt within minutes up to over an hour, depending on how it was consumed.

Other factors that can influence how long marijuana is detectable in the body include:

  • Body fat percentage: Those with higher body fat percentages may have detectable levels of marijuana for a longer time.
  • Genetics: Some people may be genetically predisposed to metabolizing marijuana more quickly or more slowly.
  • Frequency of use: Infrequent users clear marijuana more quickly than frequent users.
  • Other drugs or medications: The enzymes responsible for marijuana metabolism (CYP2C9 and CYP3A4) can be sped up or slowed down by other drugs or medications.
  • Potency of marijuana
  • Tolerance level
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How Long Does It Take Weed to Leave Your System?

The half-life of a drug is the time it takes for the body to metabolize and eliminate half of the substance. While there are a variety of cannabinoids, THC is the one most drug tests look for. In the body, THC is broken down into metabolites, which are stored in body fat until finally being excreted through feces and urine.

Some marijuana metabolites have half-lives of 20 hours, but others can be as long as 10–13 days. It can ultimately take three to five half-lives for these metabolites to be completely eliminated. This means it can take between five and 65 days for marijuana to be completely eliminated, depending on factors like how often marijuana is consumed, body fat percentage, genetics and others.

How Long Does Weed Stay in Urine?

Urine tests can show recent marijuana use (not current intoxication) because of the delay between use and the body breaking THC down into metabolites. It can take an estimated one to four days for marijuana to be undetectable in urine, though some studies have shown detectable levels for up to 70 days with chronic use.

How Long Does Weed Stay in Your Blood?

Because marijuana stays in the bloodstream for a short time, blood tests are not usually used for this purpose, with the exception of automobile accidents and some roadside sobriety checkpoints. It can take an estimated 36 hours for marijuana to be undetectable in blood, though some reports suggest up to seven days with chronic use.

How Long Does Weed Stay in Your Hair?

Hair tests are not reliably able to detect marijuana use or to determine the amount consumed. Each centimeter of hair accounts for about a one-month period of time, so the detection period depends on hair length but is generally 90 days. First-time drug use in the last seven to 14 days cannot be detected due to the time that it takes for marijuana to reach the hair.

How Long Does Weed Stay in Your Saliva?

Like blood, marijuana is present in saliva for a short time. As a result, a saliva test could show current intoxication but would not indicate level of intoxication or impairment. Marijuana is detectable for an estimated 34 hours in saliva.

How Long Does Weed Stay in Breastmilk?

Breastmilk can contain THC for up to six days after use and can affect the newborn’s brain development, resulting in hyperactivity, poor cognitive function and other long-term consequences.

Will Weed Show Up on an Employment Drug Test?

Workplace testing often first entails an immunoassay test (EMRIT or RIA). If positive, it is then sent for gas chromatograph-mass spectrometer (GCMS), which is much more sensitive, so false positives are rare. At one time, ibuprofen (Advil, Motrin) would cause false positives for marijuana. However, today’s tests have eliminated that problem.

While marijuana is legal in some states, many employers have drug-free workplace policies. These workplaces often have random drug screening policies for current employees and routine testing for new employees to ensure their workplaces are drug-free. Your employment can be terminated for failing a drug test, even in states where marijuana has been legalized.

Detoxing From Weed

The only completely reliable way to pass a drug test is to stop using marijuana. While there are many tips and tricks for how to “beat” a drug test for marijuana, most have been shown to be urban legends.

Some of these questionable techniques include:

    : This method entails drinking fluids and urinating several times prior to a drug test, then taking vitamin b-12 to add color to urine. This serves to dilute THC metabolites but does not eliminate them. : Exercising or spending time in the sauna prior to a drug test can actually backfire by releasing THC metabolites from fatty tissue into the blood. : Various companies sell substances or herbal teas claiming to “clean” the body’s traces of marijuana; however, there is little evidence to support this.

Marijuana Detox Facilities in Florida

Our treatment facilities offer medical and clinical treatments in a restorative setting where your successful recovery is our focus. In a medical detox program, your body slowly rids itself of the marijuana while under medical supervision. Doctors and nurses can quickly address any signs of withdrawal to make the process as safe and as comfortable as possible. Once patients have finished detox, they can transition directly into the full addiction treatment program.

Marijuana Addiction Treatment

The Recovery Village at Baptist Health offers a full continuum of care so that your recovery can be customized to your needs. After medical detox, marijuana addiction treatment might include either inpatient rehab where you live on-site, focused on recovery free of distractions, or outpatient rehab, where you live at home or in a sober living community and come to the facility regularly for appointments. Our partial hospitalization program (PHP) offers an intermediary step between inpatient treatment and outpatient rehab: more freedom during the day while keeping the benefit of medical supervision. Typically, outpatient rehab comes after successful inpatient rehab, where you have learned the skills necessary to live a marijuana-free life. We also provide mental health counseling for co-occurring disorders and aftercare for long-term recovery.

Depending on the level of care, we have a variety of indoor and outdoor amenities at our facility, including:

  • Swimming pool
  • Two fully equipped gyms
  • Basketball courts
  • Sand volleyball court
  • Frisbee golf
  • Horseshoe pits
  • Multiple lounges with TVs
  • Comfortable, hotel-style, semi-private rooms

Our licensed staff members are highly skilled in supporting our clients to find lasting recovery with compassionate care. As a member of the National Association of Addiction Treatment Providers and a Gold Seal Joint Commission facility, we are here to provide evidence-based, high-quality addiction treatment. Contact us today to start your journey toward a marijuana-free life.

Centers for Disease Control and Prevention. “Health Effects of Marijuana.” Reviewed June 2, 2021. Accessed February 8, 2022.

Drugs.com. “How long does Marijuana stay in your system?” Updated April 7, 2021. Accessed February 8, 2022.

U.S. National Library of Medicine. “Marijuana intoxication.” Medline Plus, Updated February 4, 2022. Accessed February 10, 2022.

Huestis, Marilyn A. “Human Cannabinoid Pharmacokinetics.” Chemistry and Biodiversity, August 21, 2007. Accessed February 20, 2022.

Huestis, M. A.; Mitchell, J. M.; & Cone, E. J. “Detection times of marijuana metabolites in urine by immunoassay and GC-MS.” Journal of Analytical Toxicology, October 1995. Accessed February 10, 2022.

Centers for Disease Control and Prevention. “What You Should Know About Using Cannabis, Including CBD, When Pregnant or Breastfeeding.” Updated October 16, 2019. Accessed February 8, 2022.

Dasgupta, Amitava. “How People Try to Beat Drug Testing.” American Association for Clinical Chemistry, February 1, 2015. Accessed February 10, 2022.

Exercise.com. “Will exercise help you to pass a drug test for cannabis?” Updated August 20, 2020. Accessed February 10, 2022.

The Recovery Village aims to improve the quality of life for people struggling with a substance use or mental health disorder with fact-based content about the nature of behavioral health conditions, treatment options and their related outcomes. We publish material that is researched, cited, edited and reviewed by licensed medical professionals. The information we provide is not intended to be a substitute for professional medical advice, diagnosis or treatment. It should not be used in place of the advice of your physician or other qualified healthcare provider.

How long does THC stay in your system?

THC can stay in your system for several weeks, but how long exactly depends on a range of factors such as frequency of use, your individual metabolic rate, and body fat percentage. That said, THC detection times rarely exceed 30 days, according to a 2005 fact-sheet written by Paul Cary, director of the Toxicology and Drug Monitoring Laboratory at the University of Missouri.

Tetrahydrocannabinol, or THC, the most notable of the active chemicals found in cannabis that is responsible for the plant’s well-known psychoactive effects, is fat soluble. Because of its preference for fats, THC finds its way into the fatty tissues of the body, where it is stored and slowly excreted. It’s this fat storage results in THC’s long detection window.

The method with which one consumes cannabis also affects which metabolic pathway THC follows in the body. That isn’t relevant only for the time it takes your body to excrete it, but also the time it takes for it to be metabolized and begin to affect you.

For instance, when cannabis is vaped or smoked, it’s quickly absorbed by the lungs and there is a sharp increase of THC in the bloodstream within minutes. The major effects of inhalation tend to last a few hours.

When cannabis is ingested, on the other hand, the THC enters the bloodstream through the intestinal walls, is sent to and processed by the liver, and only then can it go to the brain, where it causes the high. Typically the psychoactive effects of THC that is orally consumed can be felt within an hour, while peak effects occur before four hours, and the overall experience can last as long as eight hours, sometimes longer. The psychoactive effects of edibles also tend to be felt more intensely due to the production of 11-hydroxy-THC (the active metabolite of THC).

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How long a THC high lasts and how long THC stays in your system are two very different things. There are some claims of “cannabis hangovers,” with anecdotal reports of lingering fatigue following cannabis use. However, in general, when the primary psychoactive effects of cannabis (ie. the high) are over, things return to normal, despite lingering THC metabolites being released from fat cells for several days or weeks.

Everyone metabolizes THC differently

After THC is consumed, it is quickly broken down by the body and turned into molecules called metabolites. Within about six hours of smoking cannabis, cannabis metabolites can be detected in the urine. 1 More than 100 different THC metabolites 2 have been identified and their half-lives differ greatly — some metabolites can be cleared by the body quickly while others can be stored in fat tissue and detectable in urine for days,weeks, or even months.

One study published in the Journal of Analytical Toxicology examined THC concentrations in the urine of Norweigan prisoners. With these tests, scientists were able to estimate the initial half-life of THC is around 1.3 days for frequent and infrequent users. This means that within 4-7 days, the vast majority of the THC will be gone from the system. In frequent users, however, a slower excretion occurs and is reflected by a 10-day terminal half-life. The researchers found that they could detect THC in the urine of frequent users for up to 2-4 weeks after quitting.

The wide ranges presented are because there are numerous factors that determine how long THC stays in your system.

  • Metabolism: Every individual has a unique metabolic rate that is dependent on numerous factors including age, activity levels, diet, genetics, concurrent medications, and health conditions. In general, a faster metabolism results in a more rapid metabolization and excretion of THC.
  • Body fat: Since THC metabolites are stored in fat tissue, people with a higher body fat percentage will naturally store higher amounts of cannabinoids. The result is more THC lingering in the body and a longer THC detection window.
  • Gender: Women have higher body fat percentages than men on average, and therefore it may take them modestly longer than men to clear THC from their bodies.
  • Hydration: Staying hydrated does not help to clear cannabinoids more quickly, even if the internet claims it does. Dehydration does however result in more concentrated THC metabolites in urine, which may affect THC detection through urine drug screening.

Because of all of the factors involved, there may not be a way to accurately predict how long THC will remain detectable. There is, however, enough clinical research out there that one could draw general estimates to determine — how long does weed stay in your system.

Methods of testing for THC

According to a 2004 review published in the Therapeutic Drug Monitoring journal, “detection time is longest in hair, followed by urine, sweat, oral fluid, and blood.” 3

Blood Urine Hair Saliva
Single use 36 hrs 72 hrs Probably undetectable 12 hours
Moderate use 7 days 14 days 90 days 2 days
Chronic use 30 days 30+ days 90 days 28 days
Notes Detection window can vary highly depending on type of test cutoff level, metabolites screened, etc. 4 , 5 Detection beyond 30 days is uncommon but has been reported, especially in heavy use and in those with excessive body fat. 6 The detection window is extremely long. The reason 90 days is the standard window testing facilities are looked at, but can vary from individual based on hair growth and based on laboratory procedures. 7 The smallest detection window of all testing types. Still, detection times vary depending on consumption method and test type. Smoking cannabis increases the likelihood of a positive saliva test due to mouth contamination. 8

How long does THC stay in your hair follicles?

After entering and circulating through the body, some THC will reach hair follicles through small blood vessels where small amounts are deposited into the growing hair. Once the THC is in the hair, it will likely be detectable for years. In fact, hair preserves drug residues so well that scientists can even find evidence of cocaine use in the hair of a 900 year old mummy. 9 But, fear not–that is not the normal detection window. Hair follicle drug tests can assess previous drug use for up to 90 days, because as standard they only test the newest 3.9cm of hair. Since human hair usually grows 1.5gm each month, the detection window is estimated to be about 3 months. The tests are often geared for detecting a level of cannabis use equivalent to 1 or 2 joints per month.

How long does THC stay in your urine?

Urine testing is by far the most common type of THC testing. Tests can vary in their sensitivity so it’s hard to make generalizations, but according to Mayo Clinic Proceedings, 10 the primary THC metabolite can be detected in urine for the following lengths of time:

  • Single use: 3 days
  • Moderate use (four times per week): 5-7 days
  • Chronic use (daily): 10-15 days
  • Chronic heavy use: Over 30 days

How long is THC detectable in your sweat?

Sweat testing is a non-invasive cannabis testing method that has not yet, so don’t expect to get this test yet, but it could be useful for applications in the future. In one study, THC elimination was evaluated in 11 daily cannabis users after stopping cannabis use. Sweat patches were worn for seven days, and were analyzed for THC. Eight out of the 11 subjects had negative results after the second week. 11

How long is THC detectable in your saliva?

Cannabis is also detectable in saliva. According to a 2014 review on cannabinoids in oral fluid, cannabis can be detected in saliva for the following time periods:

  • Occasional cannabis users: ~2 days
  • Chronic daily cannabis smokers: ~14 days, but can be up to 28 days days

How long does THC stay in your blood?

Similar to other cannabis testing methods, the period of THC metabolite detectability in the blood is dependent on the frequency of use. According to a review published in the Therapeutic Drug Monitoring Journal, in general, THC is detectable in the blood for one to two days. 12

➤ Our recommendation for a THC home testing kit: Exploro Highly Sensitive Marijuana THC Test Kit

Other research has shown slightly longer THC blood detectability for heavy cannabis users. In a 2009 study, published in the journal Addiction, researchers tested THC blood concentrations in 25 heavy cannabis users for seven days of abstinence. Six out of 25 users had a positive test after 7 days of abstinence. Of note, this test was looking directly at THC, not the THC metabolite (THC-COOH) most commonly looked for and that lingers in the body longer. 13

Implications for drug testing

Millions of employees and potential employees are drug tested every year in the United States and elsewhere. They are measured for drug metabolites in their urine, blood, hair, saliva, breath, sweat, and even fingernails.

There are countless methods of detoxing available, with few being based on much science. These range from drinking cranberry juice to taking laxatives and other herbal supplements. Many people attempting to fool test results frequently increase the amount of water they drink in order to “flush out” THC. The reasoning behind this approach is that over-hydrating oneself decreases the concentration of THC metabolites in the urine, thus decreasing the chance of a positive result. Individuals using this over-hydration method also often take a vitamin B-12 supplement to turn their urine more yellow, making it appear less dilute.

Excessive exercise in an attempt to burn fat, since THC is stored in fat, is not unheard of either. In theory this is a logical approach, but ironically, a study published in the journal Drug & Alcohol Dependence showed that exercise can release stored THC metabolites into the bloodstream, which could actually increase the odds of testing positive. The bottom line is that there is no way to guarantee a negative test result for THC, but an understanding of the detection windows may help you better plan your next job change.

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