If they end up going the regulation route, which lets face it, the tax potential is already set up because of the medical aspect of it already being regulated to an extent. (my mother had a greencard (Wash state) during the last two years of her life fighting cancer.) It just seems to go hand in hand. It's big business, but it has been a hush hush business.. which isn't so hush hush to anyone other than law enforcement and even then that is being liberal in the statement.
I can totally see governments making monies easily off of this. I can comfortably say that I have never really been a supporter of it in a recreational sense, but I also think that what people do with their own lives is their own business. May as well capitalize on it, especially in an economy such as we are faced with. (Speaking from an American in Canada) At this stage, I think governments have to tap into things they have never done so in the past... as their people are drying up and are tapped out financially. Hell.. it can even create jobs if we get creative enough. lol