Why don't you simply stay out of places that don't conspicuously display a "NO SMOKING" sign by the door?
Excellent advice for non-smokers ... as well as for smokers. No one in Maine is being stopped from establishing their own private smoking clubs/sweat lodges. Similarly, no one is being prevented from designing, manufacturing, marketing, selling, buying, or using their own personal smoke-containment aqualung aparatus for public smoking. Everyone has lots of free will choices they can make.