Cannabis may be one of the most controversial investments. But it may also prove to be one of the most profitable this year for related cannabis stocks. That being said, here are some of the best cannabis stocks to buy for April.For one, the Pew Research Center just found that about nine in 10 Americans (88%) said that cannabis should be legal for medical or recreational use. About 57% said cannabis should be legal for both medical and recreational use. About 32% said it should just be legal for medical use ...