I am a high school student so I do not know a lot about nursing, but I know a lot about hookah. It is a flavored tobbacco and this makes it seem safe, but it's not. While not as bad as cigarette smoking, it is still damaging to your health, and probably even more so if your daughter has asthma. Then again, I am not a nurse. I recommend also talking to your daughter, because while she might be angry with you, it is important that she gets the right information about this seemingly harmless thing. As teenagers we sometimes get wrong information from our friends and I am sure she will eventually respect your opinion and help. Take care!