Although researchers and health care practitioners tend to use standard categories to classify smokers and nonsmokers, recent research suggests that individual smokers may use a variety of self-definitions regarding their smoking behavior. The purpose of this study was to examine smoking identity and smoking behavior among college students, specifically, the relationship between self-identifying as a smoker, nonsmoker, occasional smoker, or social smoker and number of days smoked in the past month. Data were obtained during a campuswide health assessment of randomly selected full-time students (N = 741). Results indicate discrepancy between smoking identity and cigarette use. Twenty percent of students who smoked in the past 30 days self-identified as nonsmokers. Such discrepancies have implications for data collection in research as well as on questionnaires and in health care interviews. Failure to understand actual smoking behavior may increase the risk that individuals will not receive effective smoking prevention and cessation interventions.