I'm likely a good example of why
vaping should NOT cause Dehydration.
130lbs., BMI 17 and 58y.o. when I switched. Vaped for 2 years, pulling 12hr manual labor(intensive labor) shifts in a Distribution warehouse filling orders for almost 525 Stores(varied by year)
My liquid intake is as haphazard as it gets and I avoid plain water like the Plague.
I'd still be pushing it if I had not suffered a serious injury.
I still weigh 130ish and still have the same drink habits, actually 3-4 cups of coffee per day most days.
Both PG and VG are hydroscopic(?), simply meaning they can attract and hold moisture.<To A Saturation Point> They can also expel moisture
, but no one mentions that.
The thing most totally ignore is - 5ml is only .17 oz and even at a ratio of 1:1 a loss of .17oz of moisture over several hours would be easily replenished with one swallow of water.
Things like Dry Mouth are not necessarily a sigh of Dehydration, but should be addressed for good oral health.
Dry Mouth: Get Facts on Causes and Treatment
Dry mouth Causes - Mayo Clinic