Alcohol, marijuana, and tobacco use patterns among youth in Canada.

摘要: The authors characterized changes in the prevalence of alcohol, tobacco, and marijuana use over time, examined age onset, co-morbid sociodemographic factors associated with ever using or a nationally representative sample Canadian youth. Data were collected from students grades 7–9 as part Youth Smoking Survey (n = 19,018 2002; n 29,243 2004). Descriptive analyses substance time. Logistic regression models used to examine trying 2004 data. Alcohol was most prevalent by youth it also only which exhibited increased rates between 2002 2004. Co-morbid common, rare find who had tobacco without having tried alcohol. As expected, poorer school performance more likely drink smoke disposable income. Such timely relevant data are important for guiding future policy, programing, surveillance activities.