Marijuana will go the way of ginseng. There was a huge ginseng bubble in the early 80s, both for investors and farmers.  The stuff took 7 years to grow and somehow nobody thought to ask - if there's more of it, and it's cheaper, will that mean it will be a commodity more people will want to buy? The answer was no, and will be for marijuana as well.  People who use marijuana use it because they like it, not because it's legal. The market for it won't increase appreciably.