Re: The vapours from these things still smell...
If you feel nauseous from exposure to e-cig vapour, then you need to immediately go to an emergency room and get checked out for sensitivity to nicotine. And never eat a potato again.
But as one assumes you don't get nauseous when walking past smokers, who's exhaled smoking contains 10 times more nicotine (as well as hundreds of other rather more toxic components), nor when eating potatoes, tomatoes or avacados which would have relatively similar exposure levels to being in a room with a vaper (if not higher) then I'd strongly suggest that your reaction is psychosomatic.