The authors report on the development and assessment of an instrument to measure baseline campus cigarette use and outcomes from prevention programs, including those using a social norms approach combined with environmental policy change. They administered the 37-item College Tobacco Survey (CTS) to a convenience sample of 1,279 college students in freshmen-level classes at a large urban university. Factor analysis of 15 belief items revealed 3 factors: Peer Environment, Personal Effects, and Campus Policy Endorsement. The findings support the survey's reliability and validity. The authors discuss potential uses of the survey in terms of social norms and environmental prevention programs.Key Words: college, construct, social norms, survey, tobacco, validation