On Nov. 8, voters in nine states will have the opportunity to vote on expanding legal access to cannabis. 25 states and Washington D.C. currently have some kind of medical cannabis law. Five of those states: Arizona, California, Maine, Massachusetts and Nevada, could join Oregon, Colorado, Washington, Alaska and Washington D.C. in legalizing so-called recreational use. If all five pass, 23% of Americans, about 75 million people, will live in states where cannabis is taxed and regulated for adult use.