My friend uses one. She hasn't had a real cigarette in months. I asked my doctor about them, she said the only bad thing about them is the nicotine...BUT that's nothing compared to all the bad things in a real cigarette. I say give them a try. (Of course I'm assuming you're trying to quit smoking.)
Nobody really knows what's in them there from china last time I herd a lot of product from china were re-called due to lead poisoning they like putting lead in products .I wouldn't inhale that in my lungs.Would you .Do you trust the faulty cheep uninspected crap from china.