Two or three decades back Canada tried high cigarette taxes to reduce smoking. A black market promptly appeared, complete with smuggling across the border and drive by shootings, until the tax was lowered back.

(During WW2 which had extensive gas rationing, a black market for that appeared as well, and (you guessed it) drive by shootings.)

Of course, today we have the failed war on drugs, with drive by shootings.

There are limits to government power attempting to force morality on people.