A 48-year-old member asked:
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how long can cotinine remain in your system after smoking a cigarette?

1 doctor answer
Dr. Alan Wartenberg
A Verified Doctor answered
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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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