The aim of this study was to collect data from in-depth interviews with university students and to explore the reasons for smoking in order to design an effective intervention campaign. Smoking is highly detrimental to the health situation in Taiwan, with 19 072 deaths attributable to smoking, representing 19% of all deaths in 1989 (Wen et al., 1992). The smoking rate is high among males (55%) and moderate among females (3.2%) (Li, 1995). The prevalence of smoking among young people is also high, at 30% among male college students and 2.9% among female students (Huang et al., 1988). In this study, we examined the influences of cognitive factors and the social environment (Janz & Becker, 1974; Langlie, 1977; Mermelstein et al., 1983) on the smoking behaviour of university students.