A member asked:

How far back can nicotine tests trace use?

A doctor has provided 1 answer

A few days for most: kinds of tests - oral swabs can detect 3-5 days with sensitive tests or in heavier smokers, blood and urine usually 3 days or so. Hair testing, however, can detect any drug use, including nicotine, going back months, depending on the length of your hair and your individual hair growth pattern.

Answered 3/12/2018

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