When it comes to something as harmful as cigarette smoke, I can't understand why restaurant and other business owners believe they should make a decision that negatively affects the health and safety of their customers and employees.
Restaurant owners must abide by the directives of the McLean County Health Department. The food they serve must be approved by the Food and Drug Administration. They must dispose of their waste in a way that satisfies the Environmental Protection Agency. They must protect their workers as directed by the Occupational Safety & Health Act. They must provide accommodations for the handicapped by directive of the Americans With Disabilities Act. They must follow the directives of building safety and fire departments. By city ordinance, they are required to remove snow and ice from their sidewalks and entrances.
Operating a business that serves the public comes with the responsibility of safety and health to customers and employees. Government, an instrument of the people, controls all of these things because it is in the best interest of the people. Breathing cigarette smoke is not in the "best interest" of anyone.