2018 was the year of the pot stock. But, while Canadian cannabis companies like Tilray and Canopy Growth Corp. reached sky-high valuations, their American counterparts experienced a much slower burn. While some say U.S. pot companies will never catch up, others believe they're just waiting to ignite. HIGH RISK. HIGH REWARD: CANNABIS INC. premieres Wednesday, September 4 at 6P ET/3P PT.