Weight gain from stopping smoking is usually caused by people still feeling the need to have something in their mouth so start eating more. With vaping they will be fulfilling the need still so I doubt there would be many people who gained weight from that.
I put on about 2st over a course of 6 months after giving up tobacco & started vaping. The only thing I can put it down to is me enjoying food a lot more since getting my taste buds back & then over indulging on the wrong things, that tasted different when I was a smoker.
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As long as you are addicted to nicotine there will be no change