Alcohol prohibition is the best example, and it has decades of time to back it up. Alcohol is not "intrinsically healthy." Alcohol is similar to gambling on many terms.

There aren't many underground distilleries or alcohol smuggling operations. Using the open market for purchasing is a much better option than skirting the law. I would say that it was a success, albeit with the known negatives, but it's better than it was.

Your prostitution example is still new, it's going to take time to adjust. Are you saying that the organized crime today at casinos is just as bad as it was? I'd have to see some statistics on that.