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Depends what you have been smoking. The half-life of nicotine in the body is 2 hours, meaning that every 2 hours the level of nicotine decreases by half. After about 2 days it is unlikely that nicotine would be detectable.

Marijuana is detectable in the blood for anything up to 2 months - but this is due to a chemical in the plant which has little effect on the high (i.e. you could be pumped full of it and you would not be stoned) being absorbed by the body fat and being slowly released into the bloodstream.

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16y ago

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