I had dry mouth and extreme thirst, especially when
vaping high PG juices (I still do use high PG in winter; it doesn't get too thick to use when colder). I have to drink at least 3 quarts of water a day or else my heart will pound, my breathing will get heavy, and I'll get out of breath.
When I'm
vaping high VG (65% VG), I still have to drink more water than a non-vaper, but I also have to clear my
throat constantly, even though I no longer lung inhale, but instead exhale through my mouth and nose. I guess the VG is coming out of my trachea.