Don't know if your weight increase is connected to vaping or not. A guess would say no. Anyway i could give you some dietry advice but it probably won't be welcome. I could tell you what i'm doing to lose weight at the moment because i'm losing weight quite dramatically. As i'm not working i can spend a lot of time exercising but that's another story. But dietry wise i've got a good handle on it. I eat cereal for breakfast, cereal for lunch and cereal for dinner all with skimmed milk. I'll drink orange squash throughout the day to stay hydrated and maybe coffee and a couple biscuits, that's it !. 375 grammes of standard cereal is about 1000 calories. So i just eat that much a day. Even without exercise you'd still lose weight. Slowly sure but better to lose than to gain, i say that but it's only beneficial if one is overweight. Personally i do exercise a hell of a lot at the moment because i was about 4 stone over weight. If i told you i cycle 60 miles a day you probably won't believe me. It takes me about 5 hours by the way, at an average speed of 12 mph. It's just moderate exercise. Aerobic cardio vascular. It doesn't matter that it isn't hard work, what does matter is duration. I burn off 3000 calories during my 2, 2 and a half hour sessions. So each day i estimate losing around 2000 calories after taking into account what i've eaten. I was 15 stone 8 weeks ago and now i am 12 stone 13 pounds. I will continue until i am about 11 stone. Then i'll start with an ab roller. I've got a plan, nevermind !. All this has nothing to do with what you are experiencing i know but i do have a point. If i were to do the same exercise but keep my old eating habits all my work would be for nothing. The most important part of my daily routine is not eating anything fatty. Just carbs and that's it. I just control what i eat. It means everything !. Not that you're interested but my goal is 11 stone by the end of the year. I know, i don't see anyone else doing it either.
Probably doesn't help. That's my 2 cents.