Out of our full team of 8 Domino players only 3 smoke (it was 4 but one has recently stopped, of the rest only one has never smoked). Of the Crib team there is only 3 of the 8 as well (this time 2 have never smoked). These are games that are frequently played by older persons and dyed in the wool pub users and, when playing against non smokers they tend to cut down on the numbers smoked.
I suspect there would be fewer problems than feared were smoking to be banned. (they would all play Aunt Sally instead)