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Cotinine is an alkaloid found in tobacco & metabolite of nicotine
. Cotinine is use as a biomarker
of tobacco consumption. Cotinine can be detectable upto 1 week after tobacco consumption.
levels upto 10 - 100ng/ml - mild smoking
or passive moderate smoking.
levels >100 ng/ml - heavy smoking ( 20 cigarettes per day).
can detect cotinine in blood, urine & saliva.