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Indeed, it would be easy (from a legal standpoint, if not political) to ban completely the sale of tobacco as a hazardous substance since studies have shown absolutely no health benefit to tobacco and have demonstrated significant health risks to the use of it.
Unfortunately, anybody advocating that should look at how well we're doing against the illegal use of controlled substances (aka The War on Drugs) and see how pointless it would be to ban the sale of tobacco products.

And who can forget Prohibition - the banning of alcoholic beverages of the 1920s. That worked well, too. For criminals.