I haven't been vaping long enough to tell, nor have I made the complete switch to my PV (I'm still smoking a couple analogues a day, but I pay more attention to the analogues I haven't smoked!)
Because of my birth control method, and stress from college, I've already gained approximately 30 pounds since August. Since I got my PV two weeks ago, I use it not only to satisfy most of my urges to smoke, but my urges to snack as well! (Being a college student means a lot of sitting around, in my experience... which means snacking!)
I'm planning on getting some tasty 0 nic juice to satisfy my snack urges, and I've found a vape a LOT. (I rarely put my baby down! Some of the friends I've hung out with since I got my PV poke fun at it. :'D Luckily, I'm not self-conscious).
Point being, I haven't gained anything during the last two weeks. Additionally, cutting back so significantly on smoking allows me to work out for longer periods of time! I'm slimming down, while not losing weight, because of a combination of a healthier diet, less snacking, and working out... all of these being helped along by my PV.
So, congrats on you starting your journey into vaping!

I'm still a newbie myself, but my advice is don't let the learning curve make you call it quits, in the long run I believe it will be worth it! And be vigilant about eating well & exercising more if you'd like to avoid the weight gain associated with quitting analogues.
