You DO realise that when drugs are legal, it will be IMPOSSIBLE to sell them illegally by virtue of the fact that they'd be legal, right?


Actually that is not true. There are all kinds of legal items that can be bought or sold illegally. Cigarettes are a prime example of a legal susbstance that is a huge money maker in the black market. One truckload of the things can net the smuggler 2million dollars. 

If pot should ever get legalized, and it should be IMHO, you can rest assured a good portion will still be smuggled and sold illegally just like tobacco is. People will gravitate to cheaper prices.

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