A few years ago, we were preparing to move from Ohio to California for my daughter's fourth year of Graduate School. We were trying to prepare my grandson, who has autism, for this major change in his lifestyle. We had recently started vaping, and my daughter and I were vaping as we had smoked, that is, we were chain vaping under stress. I was also on prescribed antidepressants, anti anxiety meds, and blood pressure meds. You bet I had some issues with proper hydration. It took me a while to first figure out what was going on, and then to take care of the problem. At this point in my life, there is always a glass or cup of some sort of liquid by my side.
Right now, my grandson, who does not vape, is on some fairly heavy duty prescription meds for issues related to his autism, some of which can lead to hydration issues. The Koolaid pitcher is always full (he will not drink plain water, one of his quirks with the autism), we have nice juicy fruits on hand (he is partial to grapes, strawberries, and clementines or oranges). Whether he wants it or not, he always gets a large glass of non-caffeinated beverage with every meal, snack, and his meds. We have everything on hand to make homemade Gatorade (Fakerade, as it is known in our house). If we think it is necessary, we purchase "real" Gatorade for him. He is actively encouraged to keep liquids in his room for sipping when he wants them.
We moved from Ohio, with higher humidity, to Northern California, which, in the last few years, has been under drought conditions - little to no rain, high, dry heat, etc. Add to that central heat when we need it, air conditioning quite a bit of the year, and you have other contributors to hydration issues.
Hydration issues can affect anyone, at any time, for any variety of reasons. Vaping can be a contributor, along with nicotine, caffeine, medications, etc. Personally, I would not "blame" vaping for hydration issues, nor would I discount the effects it can contribute to hydration issues.