I've lost weight but I don't think it has anything to do with vaping... Or moreso.. if I were eating normally, I wouldn't lose weight just by vaping various flavors. (I've been on a strict diet, which I attribute to the weight loss, not vaping) While I think that it helps to be able to vape things that you may not be able to eat, I don't think on its own it's enough to lose weight. On the flip side, I definitely don't think it causes weight gain.