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<0.01; paired t-test.
#Smoker > nonsmoker at p<0.00001; t-test.
Concentrations of nicotine and metabolites in plasma during active and placebo cigarette scans.