Trends in tobacco consumption among new students in Universidad Nacional Autonoma de Mexico, from 1989 to 1998

Objective. The purpose of this study was to describe the tobacco smoking patterns in students in the Universidad Nacional Autonoma cle Mexico system, (Mexico's National Autonomous University, UNAM), between 1989 and 1998. Material and Methods. This is a time-series, cohort study conducted in the year 2000. The overall prevalence of smoking, age- and sex-specific prevalence rates, and the prevalence of subjects smoking 11 or more cigarettes daily, were estimated for 103 582 new students aged 14 to 25 years.The same subjects were contacted for a second time, to estimate the cumulative incidence of smoking during the high school period. Associations were tested using a chi-squared test for trends, and prevalence odds ratios were obtained using a logistic regression model. Results. The overall prevalence of smoking increased during the study period, mainly after 1993 among younger and female subjects. A higher smoking incidence was found among students of higher economic level. During the high school years, the incidence of smoking initiation was 12% for females and 19% for males. The probability of smoking increased with older age, male gender, and at the final years of the study period. Conclusions. In the last decade, evident changes in young students' smoking patterns have occurred. Antitobacco campaigns targeting young people should be implemented. The English version of this paper is available at: http://www.insp.mx/salud/index.html.