COMPETING THEORIES OF MARIHUANA USE - LONGITUDINAL-STUDY

Constructive debate over public policy concerning the use and possession of marijuana is hampered by a lack of adequate empirical tests which assess the relative independent predictive power of theories designed to account for marijuana use. This paper presents a longitudinal study of college student marijuana use which allows assessment of the relative utility of certain of these theories. Consistent with prior studies, orientation toward a marijuana-using reference group is the most substantial predictor of marijuana use in this study. Contrary to earlier conclusions based solely on cross-sectional data, marijuana use at follow-up is not related to initial lack of commitment to conventional institutions, directly or indirectly, when statistical controls for other theoretical variables are applied. In addition, psychological distress at follow-up is associated with lower levels of initial marijuana use, when other spurious effects are removed. Finally, degree of involvement in conventional activities is not related to marijuana use. The implications for reinterpretation of previous data are discussed.