Trends in the prevalence of psychoactive substance use among Iława’s junior high school students in 2001–2014 on the background of other surveys results

Introduction: The main aim of this paper is to present trends in the prevalence of psychoactive substance use among students from Iława, in comparison with trends observed in the ESPAD and the Warsaw/Mokotów studies. Material and methods: The Iława study has been conducted since December 2001, repeated in years 2005, 2010, 2012 and 2014, in the whole local population of 15-year old students (300 to 500 participants in each edition) applying always the same procedure. Trends in the prevalence of smoking, drinking alcohol and other psychoactive substance use were analysed. Results: The last edition of the Iława study from 2014 revealed declines in the majority of substance use prevalence indicators over the last Streszczenie