What a difference a few years makes. Marijuana has gone from being a strictly illegal commodity virtually everywhere to one which is for all practical purposes legal in many U.S. states -- albeit with restrictions and regulations -- and totally legal as of last month in Canada. As a result, a number of public companies have sprung up to grow and wholesale the crop. But this early in newly open market, it's still quite hazy how profitable those businesses might be, and speculation about that has led, inevitably, to seriously speculative stock price movements.

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