On the one hand, I agree with B2B because I feel like if I want to open a bar called "Smokey's Smoking Bar for Smokers" in downtown Dallas, I should be able to, and I should not have to cater to non-smokers if that's not my clientele. It surprises me that the anti-smoking sentiment is strong enough that these bans can be passed and supported, but it's apparently not strong enough for people to stay away from bars and pool halls where the smoking bothers you, causing enough demand for bar owners to voluntarily ban smoking to attract the non-smoking crowd.
On the other hand, I only smoke when I drink, and I should probably quit doing that, so maybe this will help. And to ChumpDumper's point, the net effect is pretty minimal. People will just smoke outside. But for argument's sake, I think it's still an unnecessary infringement of rights and further example that people need the government to protect them from they don't like and could voluntarily avoid if they really wanted to.