Well, since I hit 30, a hangover will last for the rest of the weekend for me. I never thought I'd spend the night of drinking considering the impending hangover to come, but, aaagh I do.
That being said, if I drink a bit I always try to drink a considerable amount of water before going to bed, and now that you mention it I've had a considerable amount of hangovers since I started vaping, and to me they seem a little less crappy.
The whole dry throat thing sucks badly, but is determined by how much PG and Nic is in your juice.
Nothing worse than the first cig on the morning of a crusher hangover. Agggh, I'll never forget this one time. I thought my life force was about to end.