Ban smoking

In this article, it talks about banning smoking in public places. This law is spreading acrossed the United States. While smoking is a private cost for the smokers, in public places, smoking is an external cost to non-smokers. By making this law, the government will be using Pigou's theory...if the smokers want to smoke, they will have to pay the price of leaving the public place, to go outside and smoke, so that the non-smoker has an equal right to breath clean air. By cutting back on the smoking in public places, will the businesses pick up because more people will come out knowing that it is smoke free? Or do you think that the businesses will be losing customers because of smoking being banned?