I smoked in my last apt for 10 years, 8 of them cigarettes, then quit smoking those and took up cigars, always had a fan blowing most of the smoke out, but even that my apt already wreaked of cigarette smoke, even I noticed it once I quit.
New apt for the last couple of months and I haven't smoked inside yet (even though I can), I have a little balcony with a couple chairs and table and can just watch the tv from out there when I'm smoking. I keep thinking that I should just smoke inside but so far I haven't given in to the temptation, that might change in a few months when it's winter though, winter in San Diego can be brutal.