Concentrations of nicotine and metabolites in plasma during active and placebo cigarette scans.

Mean ± standard deviation (ng/mL) of individual subjects' means across 2–75 min, except for the second nicotine row representing nicotine concentrations only from 2–10 min.Limits of quantification were 1 ng/mL for cotinine, OH-cotinine and norcotinine, and 2.5 ng/mL for nicotine at individual time point.* Active cigarette scan values > placebo cigarette scan value at p#Smoker > nonsmoker at pConcentrations of nicotine and metabolites in plasma during active and placebo cigarette scans.