In January 1965 at the University of Illinois, Urbana, from information selected from the student data system and questionnaires, 102 variables were obtained on selected demographic, socioeconomic, attitudinal, and academic characteristics and the smoking habits of 3,567 freshmen enrolled in Rhetoric 101. The difference between smokers and nonsmokers was significant at the 0.001 level of probability for the following variables: freshman approval of teenage smoking, academic achievement, organization membership and use of leisure time, belief that lung cancer was more likely to develop in smokers than in nonsmokers, smoking habits of parents, place of residence when in high school, smoking habits of campus roommates, and belief that teenage smoking is a public health problem. Sixty percent of the freshmen did not smoke, and 43% of those who smoked wished to discontinue.