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Even if the substance is present in slightest amount in the bloodstream the test will detect its presence and indicate accordingly. Nicotine stays in your blood for maximum 3 days after the last nicotine product you consume.
Blood Test for Nicotine. The answer to the question as to how long does nicotine stay in your blood rests on the fact that it gets transformed into a metabolite called cotinine which mixes in the blood and affects the body.