A few of years ago when I started vaping, I bought my dad a 510 kit for Christmas. He's been smoking since he was 16 and is in his 70s. I knew the technology would appeal to him and he took to it like a duck to water. He was making his own mods (I think I have a picture of some on here somewhere).
Well, after about a year of cutting down and finally ending up on straight VG, he just quit. Never picked up another analog! He's been clean for about 2 years now and swears he never wants another one. He said he drags out one of his mods and vapes on occasion, just to have something to play with but for the most part he is no doing anything.
This is my idea of a true success story!