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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.
Answer Wiki. Nicotine can stay in a person's body anytime between 48 hours to 3 months. Once inside the body, nicotine is metabolised into cotinine, which can be detected in a person's blood, urine and saliva. Through most blood tests, nicotine traces can be detected anytime between 1-10 days after the last intake.