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The length of time that nicotine stays in the body and cotinine can be a reliable indicator of nicotine use depends on the amount of tobacco smoked, the number of years smoking tobacco, and the type of nicotine test performed. It can be as short as 2 days, or as long as 3 months.n these blood tests, nicotine is visible usually 1 to 3 days after last use of a nicotine-containing product, such as cigarettes, smokeless tobacco (snuff), and nicotine patches or gum.
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.