Since vaping is still "new" and hasn't been around long enough for conclusive long-term testing to be done, it's not known if vaping is hazardous to your health or not. Even if it's at 0 nic level. That said, I'd never recommend vaping to a non-smoker. Why take the chance that vaping is bad for you? Of course, it's better than cigarettes and its 4000+ chemicals and I feel so much better than I did when I still smoked, but why take the chance that this might harm your health if you're not trying to get off of cigarettes?