“…This study found that during craving states elicited by a combination of nicotine deprivation and smoking cue exposure, our craving responses tended to covary and thus provided support for an assumption implicit in many theories of craving, such as conditioned withdrawal, conditioned compensatory response, conditioned appetitive motivation, and social learning theory (Drummond, Cooper, & Glautier, 1994;Niaura et al, 1988). As has been suggested with emotional states such as fear, response covariation is more likely to appear during intense, rather than mild, emotional states (Hodgson & Rachman, 1974;Lang, 1984).…”