One year after partial legalisation in Germany: Trends in cannabis use among young people between 2008 and 2025 Background: One year after the partial legalisation of cannabis, the effects on cannabis use among young people in Germany were investigated. Methods: Based on twelve representative studies from 2008 to 2025, changes in the 12-month prevalence of cannabis use among 12- to 17-year-old adolescents and 18- to 25-year-old young adults were presented, and trends over time were estimated.