I was totally worried about putting on weight as well, after smoking for 2 decades. I've actually managed to lose weight when I switched to eliquids (my favourite one is Mojito from Simply E Liquid), i lost over 15pounds already, that's not weight that i put on and lost, that's weight that i lost, because i just take a drag (or 5 lol) from my ecig loaded with my fave sweets flavour and off i go, which makes it even healthier cuz i have a much lower sugar intake!