How Long Does THC Stay In Your Body There are many reasons that “How Long Does THC Stay In Your Body?” remains one of the most frequent questions asked by new Weed Store Reviews readers. Some are interested for health reasons, others have job interview whiz-quizzes to content with and so on. That’s why we decided to dig deeper to get you the most comprehensive and up to date answer.

The amount of time that your body retains trace amounts of marijuana depends on several factors, including how often you smoked and your present biological metabolism rate.

Urine testing, aka urinalysis, is the most common way companies screen for marijuana use and unfortunately urinalysis is the least accurate, least reliable and most variable test of its kind – leaving us with a laundry list of factors to consider when trying to guesstimate how long it will take for you to ‘pee clean.’


THC is the psychoactive ingredient in marijuana that causes humans to feel high. Urine tests detect a slightly different chemical named THC-COOH. THC-COOH is actually a metabolite of THC produced in the liver as it processes the THC and while THC leaves the body relatively quickly, THC-COOH is retained in the body much longer. 50 ng/mL is the amount of THC-COOH most tests use to determine a “positive” result.


Metabolism of THC-COOH

Your body’s ability to process THC-COOH comes down to the level of your metabolism. That includes everything from your physical fitness, to your liver health, weight, body mass index, age and more. For now, it should suffice to say that Michael Phelps can process a massive night of bong-hits much faster than Willie Nelson can clear out the exact same organic test markers. The amount of marijuana you consume during your most recent session, and the amount you have consumed over your history can also alter the window of time that your body retains traces of THC. Again, it is unlikely Willie Nelson will be able to pass a whizz-quiz any time soon.

The following are general guidelines you may want to consult as ballpark numbers. However we provide these numbers with three important caveats. Never assume you are completely clear without doing a home test yourself, never use this information to circumvent the law (or to in any way endanger others through irresponsible / illegal marijuana use, and always create your own personal profile by doing a series of home tests to see how long it takes your body to process any specific substance.

Someone who smokes occasionally will likely test positive for at least 3 days after marijuana use according to a review by the National Drug Court Institute (NDCI). “Occasional marijuana use (or single event usage), at the 50 ng/mL cutoff level, it would be unusual for the detection of cannabinoids in urine to extend beyond 3-4 days following the smoking episode.”

Similar studies suggest that many who utilizes cannabis frequently are likely to test positive for a full seven days after most recent use. According to the NDCI, after 10 full days almost every users should pass a urine test at the 50 ng/mL threshold. “Based upon recent scientific evidence, at the 50 ng/mL cutoff concentration for the detection of cannabinoids in urine, it would be unlikely for a chronic user to produce a positive urine drug test result for longer than 10 days after the last smoking episode.”

In one extreme case, a person who reported using cannabis heavily for over 10 years tested positive 67 full days after their most recent marijuana smoking session. There is no way to know if that person was Willie Nelson or not. While there are a number of products being marketed as urine cleansers to help people pass urinalysis tests you should always be skeptical of their claims. Drinking a large amount of  water may naturally dilute anything found in your urine, but drinking too much water may spoil the sample are cause your test to come back so skewed for other minerals and metabolites that you run the risk of suspicion from that as well.

The smartest decision is responsible use. Only utilize marijuana where doing so is legal and in ways that are permitted by your career or other responsibilities. If you live somewhere that cannabis use is illegal or work somewhere that it is prohibited, it becomes easier to move to a new location, find a new job or work for national marijuana reform than to waste your time trying to outsmart a room full of chemist as they dissect your urine specimen a few times a month.

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