Well, I've been vaping now for a little over a year. Although I still use nicotine solution, I feel better than I did when I smoked analogs.
I smoked analogs for over 26 years. One of the main reasons I quit smoking analogs was because I could notice some kind of change to them over the past couple of years. They started to sizzle and burn out often, had a new "almost poison-like" odor, and eventually one puff would start to make me dry heave. I would wake up in the evenings to go to the bathroom and puke blood.
Just today I was speaking to another vaporer/ex-smoker of 24 years on ventrilo and he confirmed my suspicion.
http://en.wikipedia.org/wiki/Fire_safe_cigarette
http://www.naturalnews.com/035880_fi...gs_damage.html