摘要：AbstractThe purpose of this study was to understand the evolution of substance use, namely tobacco, alcohol and drugs, among Portuguese adolescents and the relation with demographic variables. The sample included 16058 students in the 6th, 8th and 10th grades of the public school system from the Portuguese HBSC study. The results show a decrease substance use from the study of 2002 to 2006, and stabilization from de study of 2006 to 2010. According to the variants gender and age, it shows a higher use on boys of the 10th grade, therefore, agreeing with the theoretical results of the literature.
