In any single law, that prohibits substances there is going to be the danger of a black market. In Canada, a black market for alcohol developed despite the legal status of alcohol (it was due to high taxation). The Association of Canadian Distillers actually estimated that 25 % of all spirits in Ontario are consumed illegally (without paying taxes). [1]  The problem therefore is not going to lay in the ban itself, but in the enforcement of legislation and thorough control of the markets.  [1] Mackenzie Institute, Prohibition’s Hangover – Ontario’s Black Market and Alcohol,  , accessed 08/17/2011