I can care less about if my room has good air cleaning ability or not. Afterall, I live in Chicago, which means basically for almost 3 months straight, my windows in my apartment must be closed for the entire time. You really think I would get out of my tank top and shorts with the full blast heat of 75 degrees inside to go out or even crack my window open to let that 0 degrees cold air to come in ? Hell no ! Let the room be smoke filled !
Many people know IAD probably has the worst smoking lounge in C of all airports, no ventilation and the ceilings are all yellow because of tar from the cigarettes, that particular smoking lounge is always jam packed in the late afternoon for all the UA Europe bound flights. I don't care being smoke filled and neither do goalie (that's where I first met him !)
Our cigarette cravings are much more important than good ventilation !