Well then I misread the title of the thread. I thought it said "bars."
Businesses are regulated up the wazoo. There are a thousand things that bar owners cannot do that they'd like to. But they are singled out for special regulation and have been for since at least 1919. This is just another rule imposed upon them by the government on behalf of the public. Now no business owner likes to have rules imposed on them, but communities have an interest regulating the businesses that operate in their borders. There is no federal law making communities pass anti-smoking ordinances. They do it because they want to. I know that democracy seems like a really lousy system, but it is less lousy then the other ways of running things.
This thread is, but as a smoking issue, it takes in a whole lot more than bars, just because this thread mentions only bars, that doesn't exclude all the rest affected by government over regulation.
You've fallen into the trap of thinking about the USA as a democracy. We are not a democracy!
It's easy to forget that fact but it is a fact that we are supposed to be a constitutional republic.