Figure 1. Efficacy-Desire Model of quit intentions showing relations between components of the model as they relate to the reward and control systems of addiction models.

Dq and Ds are the desire to quit and smoke, respectively; Eq and Es are efficacies for quitting and smoking respectively. Respective interactions between efficacy and desire lead to Mq and Ms, which directly affect the intention to try quitting (Iq). Dashed paths indicate inverse relations; curved paths are correlations rather than effects.