I have lately been smelling cigarette smoke in my condo, primarily in the entrance and half bath just off it.
I learned last week that another neighbor has pitched a fit because of cigarette smoke getting into his apartment from the unit under his and wanted to have the HOA tell the neighbor to quit smoking.
The neighbor under me smokes, too, apparently, but I'm not clear on why the smoke is entering my unit just at my entrance and half-bath. His unit is identical to mine, and I'm sure he doesn't just smoke there in that entrance. It could be where it all gathers, however.
I use air freshener. I'm no one to demand anyone stop smoking in his own home.