The cannabis industry is all about breaking down barriers and making history in 2018. This year, we've witnessed GW Pharmaceuticals gain approval in the U.S. for the first cannabis-derived drug, and we watched as Vermont legalized recreational marijuana use entirely through the legislative process. And we can't overlook what might be the biggest news event in the history of the weed industry: Canada's legalization of recreational marijuana last week.Yet one of the more intriguing and under-the-radar developments during the year has been the push of marijuana stocks to move from the over-the-counter (OTC) exchange to more reputable U.S.