Illinois is now considering legislation to allow smoking in casinos and bars that get less than 10% of their revenue from food sales. The bars and businesses would have to get a license to allow smoking, but it doesn't seem that casinos would have to do the same. That doesn't exactly seem fair and I think the 10% is too low, but it's a start.
Bills to loosen smoking restrictions to be considered by Illinois House - Springfield, IL - The State Journal-Register

Bills to loosen smoking restrictions to be considered by Illinois House - Springfield, IL - The State Journal-Register