For people too young to remember, a lot of people were against smoking bans. The argument was pretty simple: "Why not let the market decide? If you want to go to a bar with no smokers, go to one that doesn't allow smoking." This was persuasive to a lot of people.

But I recall that non-smoking bars were extremely rare and I would always end up smelling like smoke every time I went to the bar. The problem was basically that going to a non-smoking bar would exclude any friends that smoked, so bars that became non-smoking were limiting themselves to only those patrons who didn't smoke themselves and had no one in their group who did.

In hindsight, it betrays a fundamental problem with the "let the market decide" argument: there are situations where a small number of consumers with uncommon preferences can end up altering the whole market such that the majority of consumers are forced into un-ideal purchases. In the case of smoking at bars, it was actually better to say "Hey you few people who smoke, you're kinda fucking up everything and we do actually need big government to step in and stop you from doing that."