Smoking does dehydrate you. Not noticeable with a couple of cigs, but try a full 6-7 hour hookah session without tea. You will feel like your body is crumbling any minute.
Not trying to 'start' anything but I suggest that wrinkles caused by smoking are more to do with the direct heat and poisonous chemicals found in cigarette smoke than dehydration. Someone who has been smoking for 20 years cannot simply get rid of the wrinkles by re-hydrating.
That said, drinking a lot of water when vaping is widely regarded as common sense and a quick search of research papers of the effects of inhaling PG show that dehydration is a major concern.
Wrinkles... Wrinkles... Those going away probably have more to do with the relief of toxins from your body than dehydration.
The first week I used an ejuice with PG/VG can't remember ratio... thinking it was like 70/30 and I was thirsty all the time. The second week I wanted to try Organice ejuice with 100% VG. Now I am on my second week of vaping and the feeling of dehydration is gone. I have read that its the PG that causes the need to drink a lot of water. I am beginning to think the same thing. Now I am waiting on a order for the VG juice and will have to vape the PG/VG juice I still have. I will know this coming week if my thirst comes back again. I am hooked on the organice VG as there are no artificial flavorings and don't get the aftertaste.
Interestingly enough, in addition to feeling a bit on the dry side after taking a puff, I find I cough when I inhale from my vaper-thingy. I don't remember coughing upon inhale from an analog since the very early days when I started smoking. Perhaps, it is just a phase, until you get used to the contents and changes? Does the dehydration effect remain well after you are used to using e-cigs?
I also get chapped lips but I have not noticed dehydration. Maybe I drink a lot anyways
vape to live, live to cape - vape on