It's not a restriction on smoking - it is a restriction on the rights of private property owners.
Restriction or forbidding smoking in public places, i.e. those owned and operated by the government (taxpayers), is one thing and you will find very few smokers disagreeing with it. But when you start venturing into the private property of others - entirely different story.
I'm not just talking about bars and restaurants - I'm talking all private business.
The totally idiotic smoking ban in the state of Delaware forbids smoking in any indoor enclosed area, and includes people's private homes if they run a business from home.
You have no right to enter private property - you are granted an invitation and you need abide by the rules of the host - if the host permits smoking and you don't like it you have the CHOICE to leave or stay. You do not have the right to remove that CHOICE from the owner of the property.
Does this apply to marijuana and prostitution too, or is smoking the only thing conveniently protected by the sacredness of private property?
Oh, so you're "pro-choice," huh? Anything else you believe people should have the "right" to "choose?"