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How Long Does Marijuana Stay in the User's Body?

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Updated April 08, 2014

Written or reviewed by a board-certified physician. See About.com's Medical Review Board.

Question: How Long Does Marijuana Stay in the User's Body?
Answer: THC, the active ingredient in marijuana, is rapidly absorbed by fatty tissues in the body. But, THC matabolites can be detected for several days after smoking by standard urine drug tests.

There is some evidence that THC metabolites can be detected in heavy, chronic marijuana users for several weeks after their last use.

For more detailed information about drug testing for traces of marijuana, see How Long Does Marijuana Stay in the Body?

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Back to: Marijuana FAQ for Teens

Sources:

National Institute on Drug Abuse. "Marijuana." DrugFacts Updated January 2014

National Institute on Drug Abuse. "Want to Know More?- Some FAQs about Marijuana." Marijuana: Facts for Teens Updated October 2013

National Institute on Drug Abuse. "Marijuana." Research Report Series Updated July 2012

The Partnership at DrugFree.org. "Marijuana." Drug Guide. Accessed April 2014.

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