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How long does weed stay in your system?

1 doctor weighed in
Dr. Charles Glassman
Internal Medicine

In brief: Marijuana in Body

The active ingredient in marijuana is THC.
The half-life (meaning how long it takes for 1/2 of it to "disappear") is about 20 hours. It can settle in fat cells and take time to get out of the body. Generally after 2-weeks it is all gone, although there have been reports of up to 30-days.

In brief: Marijuana in Body

The active ingredient in marijuana is THC.
The half-life (meaning how long it takes for 1/2 of it to "disappear") is about 20 hours. It can settle in fat cells and take time to get out of the body. Generally after 2-weeks it is all gone, although there have been reports of up to 30-days.
Dr. Charles Glassman
Dr. Charles Glassman
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