"Which means companies should (and do) research into it more."
Would you buy stock in a company that spent tens of millions of dollars to research a drug that people can make themselves? In their garden? With a seed?
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Research companies research the compounds in cannabis in order to make a patentable medicine. Point in case Savitex, a patented medication which has drawn investors and is now in use in hospitals.
http://www.gwpharm.com/sativex.asp
Won't take too long for the patients to figure that one out, if they haven't already (see post #127).