Smoke from a hookah is as much of a health hazard as smoke from cigarettes. Here's a difference, though. I smoke cigarettes and hookah, but I have friends who don't smoke cigarettes, but smoke hookah every once in a while. I'm betting that health-wise, those who smoke hookah occasionally are better off than people like me who smoke it on top of a couple of cigarettes every day. So if your cousin is smoking hookah sometimes, as long as she's not smoking it all the time, or taking up cigarettes, too, she's probably fine.
Now, one thing you might want to talk to her about is the fact that she's smoking, even though she's two years underage. She might get in trouble for that.
Now, one thing you might want to talk to her about is the fact that she's smoking, even though she's two years underage. She might get in trouble for that.