It's an overblown topic. Yeah, it can be annoying. Yeah, you should respect the rules of the park. But second hand smoke is such a trumped up fad in America, like inhaling it will immediately knock off a day of your life or something. Look, if you really hate it, ask them to put it out, otherwise stop bit**ing about it, and if your kid is allergic, then certainly say something. But honestly people, you gotta compare it to something; I'm sure the Jews didn't take to kindly to being shot by Hitler's rule, but if they were standing in a line ready to be shot, and someone next to them took out a cig and lit up, I highly doubt they would ask them to put it out. Just be thankfull you live in a place where people had aspirations high enough to acheive things like PKI. Would you rather have no PKI at all? Smoking is not the biggest thing in the world.