I really relish the type of high-and-mighty attitude of folks who bring their children coughing onto an airplane and then have the gall to tell you you shouldn't smoke. That's quite precious. Let's just say we're all allowed to pollute each other's airspace. Hasn't the person with a child on their lap gone further in polluting our entire world with their offspring? That child is taking up twice the oxygen and twice the resources left on the planet. The idea that someone who has a child (or three) should lecture someone who doesn't about what particles they put out in the air is the height of hypocrisy. You don't automatically win the war for the common air because you spawned.