Have to drink more water when vaping. Not only is PG hygroscopic, causing the mucous membranes in mouth and throat to dry, but just vapor moving in and out of you lugs picks up water there and removes it when you exhale. Additionally, when you first stop smoking (whether or not you vape) your body starts to clean out all the crap you have gathered in it when smoking and part of that is washing it out. Often people who quit smoking by other means notice more urine output than normal over the first few weeks. Anyone who quits smoking should be drinking more water and with vaping its even more important. You will probably always need to drink more water with vaping but for the most part it all balances out over a bit of time.