There’s still value in curbing many of these vices. Smoking is a good example. You can smoke, but you can’t advertise cigarettes, you need to be an adult to buy them, you can’t smoke them indoors, and we’ve all been subjected to propaganda from birth about how smoking is bad for you. If you have all of that in place (which took decades for tobacco and now people are trying to ban it in some places), you can have legal vices.