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A member asked:

How much time does it take for nicotine to enter your hair follicles?

A doctor has provided 1 answer

Within hours: but it isn't nicotine that enters the hair, since it only exists in the bloodstream for minutes to hours, but the metabolite cotinine lasts for days and is what is deposited in hair follicles. This occurs within hours of smoking.

Answered 8/22/2015

4.1k views

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