I also wanted to add, because I didn't think to mention it before. In our house we have several air purifiers, one of them is quite large and expensive in the room we are in the most, and we open the windows to 'air out' the house frequently.

I think it does alot on cutting down on the lingering smoke, as well as regular cleaning to eliminate 'smoke film' deposits on windows/walls etc, and we shampoo our carpets at least 2x a year. The only reason I mention this is I got to thinking of how many non-smokers come over to our house and frequently mention the house 'doesn't smell like smoke' and I even have one aunt that is allergic to smoke and our house has never bothered her.

I only thought to mention that because I have been to smokers houses where even I can smell the 'dirty ashtray' smell, the whole house is covered in 'smoke film' and the even people smell strongly of cigarettes. Those homes don't have air purifiers, they don't open many windows and don't seem to regularly clean the 'smoke film', their cars are even worse.

I don't know if that actually has any long term benefits or not as far as health goes, but it does point out the differences in how smokers live.