“…Nicotine is the principal psychoactive component of cigarette smoke and non-nicotine stimuli that become associated with nicotine delivery are thought to play an important role in the maintenance of smoking and in its relapse after attempted quitting (Caggiula et al, 2001;Childress et al, 1993;Niaura et al, 1989;O'Brien et al, 1998). Human studies have demonstrated that smoking cues increase the rate, intensity, and time of smoking (Mucha et al, 1998;Surawy et al, 1985) and significantly enhance desire to smoke (Drobes and Tiffany, 1997;Droungas et al, 1995;Lazev et al, 1999;Payne et al, 1991;Tiffany and Hakenewerth, 1991). Smoking denicotinized cigarettes (ie cue alone) produces comparable levels of smoke intake, satisfaction, and reduction of craving and withdrawal compared to smoking nicotine-containing cigarettes (ie cue plus nicotine) (Butschky et al, 1995;Dallery et al, 2003;Gross et al, 1997;Rose et al, 2000;Shahan et al, 1999).…”