1 doctor weighed in:

When after quitting smoking does nicotine show up on blood test?

1 doctor weighed in
Dr. Ahmad M Hadied
Orthopedic Surgery

In brief: 2-4 days

The clearance rate for nicotine from blood is between two to four days.
So, if you can refrain from smoking for a week prior to the test, it is unlikely that a medical screening test would be sensitive enough to detect that you were a smoker. If you are smoker havy smoker for long time it my take longer.

In brief: 2-4 days

The clearance rate for nicotine from blood is between two to four days.
So, if you can refrain from smoking for a week prior to the test, it is unlikely that a medical screening test would be sensitive enough to detect that you were a smoker. If you are smoker havy smoker for long time it my take longer.
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