Well I can't say if it helps or hurts people who smoke and play poker, it probably can hurt people who play poker who don't smoke. I have never smoked and I don't like the smell of smoke and it would be a distraction to me playing. In truth if I were to go to a casino who allowed smoking at the table I wouldn't be playing poker at their tables.
There are probably very few, if any, poker rooms in the USA where smoking is allowed. It hasn't been allowed at Foxwoods for more than twenty years, long before the rest of the casino went smoke free. I know that I read things back then in magazines like
Card Player, which mentioned card rooms not allowing smoking.
The
casinos in New Hampshire I've been to are all totally non-smoking, except for Filotimo in Manchester that has one
slots room where it is allowed.
When I was in Vegas none of the card rooms I played in allowed it, though the rest of the casino did. I heard somewhere that some casinos in Vegas don't allow it anywhere, but I was in Caesar's, The Horseshoe, Sahara, South Point and they all had smoking everywhere but the card rooms.
It doesn't bother me too much since at tournament breaks I can just step over by the slots and either pick up an ashtray to stand with, or sit down and play the machine. Helps me to keep my consumption down too.