More regulation could be coming for cannabis

With public opinion turning pro-legalization, 21 states now permit cannabis use for medical reasons or for recreation. Another 16 allow medical marijuana. But policymakers overseeing legalization were flying surprisingly blind about its effect on public health. Ben Leonard talks with Megan Wilson about the recent data on health impacts and the reaction from lawmakers on Capitol Hill. Learn more about your ad choices. Visit megaphone.fm/adchoices