The long term health costs of vaping are not as yet apparent, since the phenomenon only started in the more recent past. Vaping to quit smoking is a very good idea, the vapor from the E-cigarettes can't possibly be a bad for you as tobacco because it isn't a burning vapor and doesn't contain the farrago of plant ignition products that cigarettes do. That said, I've read that vaping has become a thing in and of itself. It, and the rise of hookahs concerns me deeply. Hookahs are I suspect worse than cigarettes, which at least have filters. Hookahs are of course equally addictive. Any addiction to nicotine is a bad thing, no one needs that albatross around their neck.