What gives ANYONE/Government the right to ban smoking in a business that wants to ban NON-Smokers?

If I owned a bar, and if I wanted to, I would ban NON-Smokers from both working and partaking of my services. Sounds to me like that is the right of the business owner, not the non-smoker or the government. What are your thoughts and please, try to make some sensible argument that grants people who have NOTHING invested in something, making the rules?