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Oral fluid collection is noninvasive and easily observed making it an attractive matrix for objectively determining smoking status. Despite large intersubject variability, cotinine oral fluid concentrations correlate with cigarettes smoked per day (CPD). Few studies, however, assessed nicotine markers in oral fluid other than cotinine; other markers might improve smoking status assessment and/or time of last cigarette.

Oral Fluid Nicotine Markers to Assess Smoking Status and Recency of Use