ABSTRACT. Objective: Relatively little research has evaluated motives for using marijuana based on users' self-reported reasons. This article details the construction and psychometric validation of a new marijuana motives questionnaire. Method: Participants included 346 marijuanausing college students who completed online assessments regarding their motives for, frequency of, and problems associated with their marijuana use. Results: Exploratory and confi rmatory factor analysis supported a 12-factor scale, including the following: (1) Enjoyment, (2) Conformity, (3) Coping, (4) Experimentation, (5) Boredom, (6) Alcohol, (7) Celebration, (8) Altered Perception, (9) Social Anxiety, (10) Relative Low Risk, (11) Sleep/Rest, and (12) Availability. Regression results indicated enjoyment, boredom, altered perception, relative low-risk, and sleep/rest were each uniquely associated with greater frequency of use. Experimentation and availability motives were associated with less use. After accounting for use, coping and sleep/rest were associated with signifi cantly more consequences whereas enjoyment was associated with fewer consequences. Additional results comparing the scale to an existing marijuana motives measure indicated comparatively good convergent validity. Conclusions: Emerging adult college students may have several different reasons for using marijuana, which are uniquely related to use and negative consequences. , and theoretical models on the determinants of alcohol use (e.g., Cooper, 1994;Cox and Klinger, 1988), smoking (e.g., Piasecki et al., 2007), and gambling (e.g., Neighbors et al., 2002) have focused on the infl uence of individual differences in motivations as contributing to subsequent patterns of behavior. In terms of substance use, although research has fi rmly established that differences in affect and behavioral regulation motives (e.g., tension reduction, social enhancement) predict patterns of drinking behaviors (e.g., Cooper, 1994;Cox and Klinger, 1990), less research has examined marijuana-use motives and their relation to use/ consequences. The purpose of the present study is to develop a comprehensive marijuana motives questionnaire, conduct preliminary reliability and validity analyses, and subsequently inform the development of an empirical motivational model of marijuana use and related consequences.
Marijuana use among young adultsMarijuana is the most commonly used illicit drug among individuals ages 18-25. Among college students, 49% report lifetime use, roughly one third report past-year use, and one fi fth report past-month use. Daily marijuana use among college students is slightly more common than daily alcohol use (4.5% vs 3.7%, respectively; Johnston et al., 2005). In a recent household survey, more than half of individuals ages 18-25 had used marijuana at least once (Substance Abuse and Mental Health Services Administration, 2005), and approximately 7.4% met marijuana dependence criteria in the past year (Chen et al., 1997). Although many marijuana users do not develop long...