Hard to get figures, but AQI of 22 looks like equal to 1 cigarette. The air pollution in Thailand is murderous, literally, with numbers above 100 typical. If they do all the air scrubbing and what have you for smoking rooms, they just might end up having cleaner air than outside the terminal!
Like I said, I don't smoke any more, but it still irks me the discrimination against smokers that puritain types put them on the level of Jeffrey Epstein. They are using a legal product in the intended manner... personally I'd rather be addicted to nicotine than the internet/social media
But that' just me