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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.
How do I pass a nicotine/cotinine test after stopping smoking for one week? You already have: cotinine, the main metabolite of nicotine, is pretty much gone from blood in 2-3 days, and from urine in 3-4 days, and nothing should be detectable after a week.