Every time you breathe some pollutant is entering your lungs far more dangerous than cigarette smoke.
As for businesses being barred from allowing smoking within it's premises I find that ridiculous. I owned a tavern in NY when the smoking ban was first enacted. All of my customers and employees smoked. I believe it is a right of a business owner to be able to opt whether smoking is allowed. We should have been allowed to post a sign at the entrance that states smoking allowed or smoke free. If a customer doesn't like smoke they have a choice not to enter. The same with an employee. Someone does not need to work in an atmosphere where the conditions are not to their liking. They can work elsewhere.