Pool has all of the defining characteristics of a sport except for the fan following. All of the fans that you see at a tournament are pool players themselves. However, that doesn't negate pool as a sport. Pool cannot be considered a game like chess or poker, because, with the right knowledge, anyone could play the game at the highest level. For example, I know nothing about Chess, but if Kasparov was sitting behind me, telling me what to do, I could play the game as well as him. It takes no physical skill to move the pieces. However, assuming he does not already play pool at my level, I could stand next to him and tell him what to do, but he could not play at my level. Smoking and drinking are not "customary" activities while playing pool. They are customary activities while at a bar, and if that bar has a pool table, then the people playing there will most likely be smoking and/or drinking. However, at the professional level it is not customary to smoke and drink while playing. There are those who do smoke and drink, but that is an individual decision, not a custom. Professional golfers don't smoke during tournaments because the PGA doesn't allow it. Years ago, however, they would smoke. Arnold Palmer would smoke during rounds. He'd set his cigarette on the grass, hit his ball, pick it back up and start walking. I have a picture of Arnold Palmer and Ben Hogan standing on the tee box, both with cigarette in hand, waiting to tee off.
The argument for pool being a sport is much stronger than the argument for it being a game, however, even some book stores (such as Borders) will stick pool books over in the games section (next to chess and poker books), but they'll stick fly fishing, archery, and skeet shooting books over in the sport section.
