“…Second, several variables that have a demonstrated relationship with smoking were not included: specific efficacy (e.g., Baer, Kamarck, Lichtenstein, & Ramson, 1989), degree to which person feels that their behavior controls their health (e.g., Leventhal & Cleary, 1980), reasons for quitting, temptation coping (Shiffman, 1984), parental disapproval (e.g., Ary, Biglan, Nautel, Weissman, & Severson, 1983;Hansen, Graham, Sobel, Shelton, Flay, & Johnson, 1987), beliefs about the connection between smoking and body weight (Meyers, Klesges, Winders, Ward, Peterson, & Eck, 1997), abstinence maintenance social support (e.g., Horwitz et al, 1985), health beliefs about smoking (e.g., Leventhal, Fleming, & Glynn, 1988), and how much money each week to spend (Alexander, Callcott, Dobson, Hardes, Lloyd, & O'Connell, 1983). Any of these variables may be related to smoking frequency or persistence and should be examined in future studies.…”