Cotinine is an alkaloid found in tobacco and is also a metabolite of nicotine. The word 'cotinine' is an anagram of 'nicotine'. Cotinine has an in vivo half-life of approximately 20 hours, and is typically detectable for several days (up to one week) after the use of tobacco. The level of cotinine in the blood is proportionate to the amount of exposure to tobacco smoke, so it is a valuable indicator of tobacco smoke exposure, including secondary (passive) smoke.[3] People who smoke menthol cigarettes may retain cotinine in the blood for a longer period because menthol can compete with enzymatic metabolism of cotinine.[4] Genetic encoding of liver enzymes may also play a role.) It is used as a biomarker for exposure to tobacco smoke and has also been sold as an antidepressant under the brand name Scotine.
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