People are idiots. I saw my doctor a year ago, had been vaping for six months at the time, smoke-free from day one. She's asking the general health questions about diet, exercise, etc. Asks me about smoking, I proudly tell her that I've been off the smokes for six months, that I'd taken up ecigs. Without losing a beat, no positive reaction at all, she asks if I'm tapering off of the ecigs so I can "qet completely free of nicotine?" She also warned me that some of her patients had "gotten infections" from ecigs.
This is a friggin' doctor, for crimeny! Rather than encouraging me for quitting that lifelong habit-of-self-destruction, she pretty much scolded me for vaping!
I'm not surprised. Every time I tell a doctor I'm vegan they want to put me on pre-natal vitamins. "Yeah I'm plant-based, not pregnant."

It doesn't matter how I explain that I run, trails, in the mountains, with people half my age (AND keep up). I have no health issues whatsoever (aside from issues from smoking), no nutritional deficiencies, in fact my cholesterol and blood pressure, etc are better than most 20-somethings. Last year I DATED at 20-something who had more lifestyle-related health issues than I do.
So I don't tell them anymore that I'm an herbivore and I don't think I'll even mention that I vape. Simples. LOL