Investors always like winning stocks, and over the past month, the most fertile ground for big winners has come from the marijuana industry. The onset of legal sales of recreational marijuana in Canada, a growing trend toward legalization in the U.S. and elsewhere across the globe, and the rising interest in marijuana producers from established players in related consumer industries like the soft-drink and spirits industries have all helped to feed speculative fire on just how high share prices can climb.One thing that Canada's marijuana producers realized early on was that there could be substantial benefits to establishing a trade organization to advocate for the industry's joint interests.