VG has carbs, if anything it will add an additional 1% to your carb intake. The reason I am aware of this is because as a diabetic, I have to measure my carb intake closely and learned through my own tryals that you can measure it by the tank. I vape 12-15 mils a day and have to adjust my insulin pump for this factor. If I have a day where I don't vape that much, I have to decrease the constant flow of insulin into my body by that amount.
Back to smoking...
By stopping smoking, your body will change due to the difference in chemicals in your body. I doubt that this alone will cause a .5 lbs per day weight gain. If you have not SIGNIFICANTLY increased your intake, I would go and have a doctor give you a check up and a tox screen quickly. A shift in your thyroid or pancreas will definitely cause this and can be caught by simple blood tests.
Back to smoking...
By stopping smoking, your body will change due to the difference in chemicals in your body. I doubt that this alone will cause a .5 lbs per day weight gain. If you have not SIGNIFICANTLY increased your intake, I would go and have a doctor give you a check up and a tox screen quickly. A shift in your thyroid or pancreas will definitely cause this and can be caught by simple blood tests.