@Mrmik - I've gained 22lbs. since quitting smoking and going to vaping only in Jan. 2014. Went from 1 - 1 1/2 PAD for 42 years, to vaping 6mg eliquids. Did not change my diet at all (the amount of food I eat, the types of foods I eat, when I eat, etc.), the amount of exercise I get...nor anything else. I also take thyroid meds, but had been on the same dosage for the last 23 years, with my weight never changing more than 2-3 pounds up or down, in that time period. Then I quit smoking, and in the last 2 1/2 years have gradually added the 22 pounds.
My endochronologist won't change my meds to help with the weight gain (nor other symptoms I'm having related to thyroid issues now that I quit smoking). He told me that quitting smoking changes your whole metabolism. That's why even many people who didn't replace smoking with eating more, nor eating snacks and other things as smoking replacements, will still gain the weight. So...maybe that's what's happened to you, too!
Since he won't adjust my meds, I'm considering raising my nic level in my DIY eliquids. I want to see if that makes a difference in my weight, and in my energy level that's been way down since quitting smoking.
I'll be interested in hearing if your weight changes if you adjust your nic level.
I started vaping Jan 1 2014 and weaned down to the last cig June 30. My weight was the same for 1 1/2 years until last winter when I started 0 nic.
I have been eating the same portions and so on, not increasing on the food intake. I should know the answer in 6 months or so.