A few researchers have tried to answer this question, with mixed results. Alex Stevens at the University of Kent reanalyzed the data from a 2015 paper which claimed that liberal cannabis policies increase teen use. The data included a multi-year survey of over 170,000 people in 38 different countries. Such a large data set has many variables that can be analyzed.
Children & Teens
Cannabis is used by many individuals with inflammatory bowel disorder (IBD), which includes conditions like Crohn’s disease and ulcerative colitis. IBD is not uncommon among people younger than 18, and about one in three of these individuals use cannabis to manage symptoms such as nausea, pain, and fatigue. Three authors review clinical and preclinical data regarding the use of cannabis and cannabinoids for IBD.