Everyone that's arguing about whether or not secondhand smoke is harmful has completely missed the point Williams was trying to make. How is passing a law that nobody can smoke in your restaurant different from passing a law that nobody can smoke in your house? They're both private property that you own, and nobody but you has any inherent right to be in either. What if New York City passed a law that you were no longer allowed to use trans fats when cooking for yourself?
The point is, if we accept that these are the sorts of laws we want our government to create, there's no logical end to the things that we might be forbidden from doing, simply because a government bureaucrat dislikes it or thinks it's bad for you.