I started vaping because I could carefully do it at work whilst being immobile. I had to stay in the same place for the best part of 9 hours straight. I might be able to leave for 5 minutes to go do something work related a couple times a day but other than that, as a 20 a day smoker, I was screwed.
Once my duty free baccy ran out on 20th August 2015 after me honeymoon, I decided to pack it up. Baccy's expensive nowadays and I already had a couple of vaping devices to fall back on. I'd be lying to you if I said I hadn't smoked the odd snout here and there over the last year and half(ish) whilst pissed. Never smoked one sober. but all in all, maximum, 10 since I "gave up."
Why am I telling you this? My motivations were monetary. I ran out of cheap baccy and didn't want to buy more. I didn't switch because of health concerns, even though I can feel a lot of health benefits from giving up the snout. I didn't think about my future or any of that. It was because I already had some vape devices and I'll be damned if 90-odd percent of what I'm paying for baccy is government tax. Sod that. (True: Back in 2006 you'd buy a box of Marlboro lights for about 5 and half quid. In Kiev, Ukraine I bought the same things for the equivalent of 55p.)
Finally, health concerns.... You're going to get cancer or you're not. Fair, there are things we do in life that can heighten the chance of contracting it but, like many others have already said, I know people knocking into their 80's and even 90's who've smoked since basically childhood who still don't have it and, equally, I've met people who got cancer even though they led a healthy lifestyle with a lovely, organic diet. It's all genetic. We'll never beat mother nature.