A study conducted in Europe advanced arguments for marijuana law reform around the world. Whenever there's news about potential marijuana legalization anywhere in the world -- or at least some measure of decriminalization -- the few publicly traded pot companies tend to benefit. Specifically, the Institute's Drug Affinity Study found that marijuana consumption among people aged 12 to 17 fell from 6.7% to 6.1% of that population over the past year. And people in that cohort who consume the drug regularly (over 10 times in the past year, per the study's benchmark) fell to 1.1% from 1.3%. On the flip side, older cannabis users saw an increase in marijuana use across a slightly longer stretch.