vaping is very dehydrating, remember that the flavors are mixed with pg and vg, or one or the other, these are both alcohol derivatives, and anyone who has ever drank alcohol knows how bad it dehydrates you, if you have never drank then you are finding out just how dehydrating it can be, but yes you must drink lots of water when vaping, and yes it can bring to the forefront just how dehydrated you have been most of your life.