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A member asked:
How long could the presence of cotinine be detected in the blood, after smoking 10 cigarettes in 1 day?
A doctor has provided 1 answer
Urine, not blood: Is what is usually measured, because it persists in urine far longer than in blood, and blood is harder to get (and the technology of detecting it is somewhat trickier, i understand). It persists in urine for about 2-3 days at most, and in lighter smokers or occasional smokers may be gone even within 24 hours.
Answered 3/2/2019
4.5k views
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