2 doctors weighed in:

How long does crack stay in your system if you smoke it?

2 doctors weighed in
Dr. Peter Forster
Psychiatry
1 doctor agrees

In brief: A few hours

The half life of Cocaine (meaning the point at which half of the Cocaine you originally had in your body is gone) is about one hour. How much you have in your body is thus equal to 1/2 to the x power where x is number of hours.
So at 3 hours you would have 1/(2x2x2) = 1/8th the original amount. For monitoring purposes (drug screens) this means most tests look at metabolites (which last longer).

In brief: A few hours

The half life of Cocaine (meaning the point at which half of the Cocaine you originally had in your body is gone) is about one hour. How much you have in your body is thus equal to 1/2 to the x power where x is number of hours.
So at 3 hours you would have 1/(2x2x2) = 1/8th the original amount. For monitoring purposes (drug screens) this means most tests look at metabolites (which last longer).
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