ABSTRACT
Tobacco smoking remains the greatest preventable cause of mortality in the United States, accounting for at least 400,000 annual deaths, as well as 3 million worldwide (Peto et al., 1996). Primary prevention efforts have been instrumental in helping to reduce the prevalence of smoking in the United States from 40% to 25% of adults since the 1950s. However, in the 1990s this trend has flattened, and teenage smoking may be increasing (Giovino, Henningfield, Tomar, Escobedo, & Slade, 1995). Moreover, tobacco use is increasing in developing countries (Peto et al., 1996). Thus, improved interventions to help smokers quit will be needed in order to reduce further health costs due to tobacco.
