In 1992, Iceland had all its 14, 15, and 16-year-olds fill out a survey about their experience with drugs and alcohol. 25% smoked daily, and over 40% had gotten drunk in the past month. Since then, Iceland has implemented a kind of radical common sense, and the problem has been all but solved. Writing for Mosaic, Emma Young details the changes: Today, Iceland tops the European table for the cleanest-living teens. The percentage of 15- and 16-year-olds who had been drunk in the previous month plummeted from 42% in 1998 to 5% in 2016. The percentage who have ever used cannabis is down from 17% to 7%. Those smoking cigarettes every day fell from 23% to just 3%.