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Design and timeline of STUDY 1 procedures. Nicotine deprivation was a within-subject condition and monetary condition was a between-subject variable. The delay period commenced at 4 p.m. Study 2 was of identical design but subjects were randomized to placebo, bupropion, or varenicline; only completed one laboratory session following 18 hr of nicotine deprivation; and were reinforced $1.00 for every 5 min they could resist smoking.
