I don't know about the premature aging as that's not anything I've ever really cared about. But for what my 2 cents is worth I can voice an educated opinion in regards to the bad skin. I've had horrible skin my whole life, and it just got worse when I first started smoking. I always chocked it up to puberty since I started smoking at 13. But when I first started vaping I noticed a drastic difference in my skin about 3 weeks later. I had a bit of a relapse back to analogs about 6 weeks later and so did my skin. but now that I'm back on the e-cig bandwagon I'm hoping my skin will decide to like me again. I think all the crap in the smoke you exhale from an analog seriously irritates the skin.

Again, just my observations from personal experiance, for what they're worth... I'm sure there are lots of people on this forum that know a lot more than I do.