Fig. 2.

a Simple slopes analysis showing the change in association between smoking urges factor 1 (craving) and number of puffs consumed in the ad libitum smoking session (drug-taking) as a function of three levels of BIS nonplanning impulsivity (low, median, high). The progressive reduction in the association between craving and drug-taking across levels of nonplanning impulsivity is indicative of a transition to automatic (non-intentional) control of drug-taking. b Simples slopes analysis with percent tobacco choice (drug-seeking) as the dependent measure, shows no comparable decoupling from craving across levels of nonplanning impulsivity