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I think it depends on the person, but usually from 1 - 3 months, sometimes longer.

I once failed a urine test having not smoked marijuana for nearly 3 months, but having been in proximity to smokers much more recently. Upon explaining my recent proximity to marijuana smoke the doctor administering the test claimed it would not cause the test to return positive like it did.

I am not entirely sure I believe him.

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13y ago
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