How long does marijuana stay in your system?

In: Marijuana, Drug Cleansing

Answers.com > Wiki Answers > Categories > Health > Medication and Drugs > Illegal Drugs > Marijuana > How long does marijuana stay in your system?
Answer:
According to the website of Columbia University's Health Services:

Marijuana itself does not "stay" in your system, but the main chemical in marijuana, THC, does. In fact, it may stay in your system forever because it is stored in fatty tissues of various organs.

Despite being stored in body fat, THC is only detectable for a certain amount of time. Many drug tests, including urine tests, look for 9-carboxy-THC which is the by-product of your body metabolizing the THC in your fat.

Marijuana Detection Times:

Frequent users blood drug test (defined as someone who smokes several times per week)
THC: 4-8 hours after smoking
THC by-product: 2 or more weeks after smoking

Frequent users urine drug test
THC by-product: 2 weeks to a month after smoking (3 months for extremely heavy users)

Infrequent users blood drug test
THC: 3-4 hours after smoking
THC by-product: 2-3 days after smoking

Infrequent users urine drug test
THC by-product: up to 10 days after smoking

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First answer by ID3416525674. Last edit by R1ch89. Contributor trust: 9 [recommend contributorrecommended]. Question popularity: 294 [recommend question].
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