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Mean subjective effects of an acute dose of nicotine (triangles) or placebo (circles) in non-smokers. Data were collected using visual analog scales at baseline (just prior to drug administration), pretest (30 min after drug administration), and posttest (90 min after drug administration). Statistically significant differences between drug conditions are indicated for *p < 0.05 and **p < 0.01. Error bars show standard errors of the means
