These big pot stocks trading on the Nasdaq have the most to gain from legalization. But which is the best long- term buy? Many cannabis investors are showing signs of bullishness again now that the U.S. government announced it moved forward with efforts to reschedule marijuana into a less serious drug regulatory category. The recategorization doesn't mean that marijuana legalization in the U.S. is inevitable, but it's a clear sign of a change in regulatory attitude on the substance that suggests legalizatio ...