I vape a 50/50 mix of PG and VG. She's had no problems at all, and couldn't be happier. She always swore she'd never date a smoker, but I was smoking when we got together 9 years ago, and continued smoking until June 13th. I tried gum, lozenges, patches, and they all just got me angry because they didn't deliver nicotine the right way and my brain wanted a damn cigarette! Vaping was an instant, easy switch for me. I had one cigarette at the end of the day I got my PV, just to see the difference. I threw 2/3 of a pack away the next morning and haven't looked back...except for camping last weekend. But once I got home, smokes are gone again.