Canadians looking for exponential gains can consider investing in the cannabis sector. Canada legalized marijuana for recreational use almost three years back, and now it’s quite possible for pot to be legalized at the federal level in the United States as well. However, while Canadian cannabis producers such as Aurora Cannabis (TSX:ACB)(NYSE:ACB) are struggling with lower-than-expected demand, negative profit margins, and a slew of other structural issues, their counterparts south of the border continue to grow at an enviable pace.