Some of the issues the government should be involved in are based upon issues of morals - stealing and murder come to mind very quickly.
Some of the issues the government should be involved in are based upon issues of health - controlling the spread of contagious disease comes quickly to mind.
Banning smoking in private businesses does not fall into either category.
If you dislike smoking or seeing anyone doing so, feel free to patronize those establishments that have chosen to cater to such as yourself. But remember, that these bans remove the right of the owners of the establishments that have chosen to voluntarily go non-smoking and thus cater to you. They created their own niche, and the government has now destroyed it.
The government doesn't allow bars to have naked women performing sex acts live on stage either. The government does not allow me to turn my private home into a bar. The government does not allow bar owners to permit smoking crack cocaine in their establishments.
The fact of the matter is that the "government" does these things because the citizenry wants them to. If a majority of the citizens wished to allow prostitution or smoking in bars then it would be allowed. The "government" is us.