Investors looking for marijuana stocks to buy have no shortage of options that are cheaper than they were a month ago, let alone a year ago. But caution is advised: in this sector, it’s an enormous risk to chase “cheap” stocks. That said, this risk again popped up this week when Aurora Cannabis (NYSE: ACB ) reported earnings. ACB already was down more than 90% from last year’s highs before the release, but soft guidance for the current quarter sent ACB stock plunging another 29%. .en.