Two of investors' all-time favorite cannabis companies released quarterly results last week. Canada-based Aurora Cannabis (NASDAQ:ACB) and Canopy Growth (NASDAQ:CGC) have made investors rich in the past. Both had an early mover advantage in the Canadian medical cannabis market. However, the last couple of years have been a roller-coaster ride. Besides some of their own mistakes, external headwinds like regulatory challenges in Canada delayed the opening of legal stores, which slowed down growth for these cannabis specialists.