I tend to agree with Txplshrk, in that I don't care much whether it is credited as being a sport or not. However, for the sake of argument, I do think it can be considered a sport. The dictionary seems to say that if it's a physical activity requiring skill, then it's a sport. For example, dictionary.com's first definition of sport is:
an athletic activity requiring skill or physical prowess and often of a competitive nature, as racing, baseball, tennis, golf, bowling, wrestling, boxing, hunting, fishing, etc.
Shoot, if fishing and bowling are sports, according to the dictionary, then pool is
definitely a sport. LOL. We tend to attach the requirement that a sport must provide exercise, when in fact that is not necessarily true.