Polydrug Use of Tobacco and Cannabis in a Cohort of Young People from Central Catalonia (2012–2020)

The aim of this study was to estimate the prevalence tobacco and cannabis use, their relationship, in a cohort adolescents from Central Catalonia period 2012–2020. had prospective longitudinal design with 828 students 4th year Compulsory Secondary Education. In 2012, answered health behaviour survey; 2016, 342; 2020, 265. dependent variables were: exclusive last month use; polydrug use cannabis; no month. Independent were sex follow-up year. For analysis, prevalences used significance level 0.05. Polydrug went 11.5% (95% CI: 7.4–17.6) among girls 8.2% 4.3–15.2) boys 7.0% 3.9–12.3) 13.7% 8.4–21.7) 2020. With regards those who 33.3% (14.8–58.9) continued using it 22.2% (7.9–48.6) 2020; boys, users 2012 44.4% (14.5–79.0) There is association between there an important percentage young people do consumption at very early ages.