They know as well as I how bad it is for them. I, however, do not agree with you.  If I own an establishment I believe that the government has a right to regulate those things that can be dangerous but not be seen. Such as a heating unit, which may emit unseen gasses or refrigeration which unregulated may cause food contamination. In the case of smoking, it can be smelled and seen and warned against.  But if it is my business and I choose to allow smoking, my employees are aware when the are hired and the public is notified, I believe that my right on my property is just that. Your right to come in is really an invitation not an entitlement.