Just to throw in another aspect of the issue. How about the employees of the businesses? Shouldn't they have a work place that is safe? If your profession is bartending (non-smoker) and all the bars/restaurants allow smoking at the bar what are you to do?
They don't have to work there. Just as you are free to choose where you buy things, you and everyone else are free to choose where you work. Some jobs are more dangerous than others, everyone is free to choose which job they want to pursue. Making someone work in a bar or anywhere else is called slavery, and is illegal, even if there is no smoking.