With some small exceptions over the past couple of years, marijuana’s expansion has been practically unstoppable. In the November elections, eight of the nine states voting on cannabis initiatives and amendments favored legalizing medical or recreational pot (sorry, Arizonans), while two states, Ohio and Pennsylvania, also wound up legalizing medical cannabis entirely through the legislative process last year. By year’s end, 28 states had legalized medical cannabis, while eight had legalized recreational weed.