A 48-year-old member asked:
how long can cotinine remain in your system after smoking a cigarette?
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A Verified Doctor answered
A US doctor answered Learn more
Depends on test: and, to some extent, how heavy a smoker you are. It is generally short-acting, and can be detected in blood and urine for 2-3 days, and with oral swabs for perhaps a day or so more after that. Hair testing can go back months, depending on length of hair and growth rate.
Answered on Sep 18, 2018
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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 ... Read More
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A female asked:
A Verified Doctor answered
A US doctor answered Learn more
Urine nicotine: Data show that urine can still test positive for 10 to 15 days, and even 20 days in some. Urine can test positive for 20-25 days for cotinine.
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