I'm a year + into vaping and I notice clearer lungs and fresher breath. I'm also regular as Old Faithful.
Nicotine addiction. Severe depression of wallet size. Anger management classes caused by rebuilding RDAs
Feel better than ever. Unfortunately, I spend almost as much on supplies as I did on smokes...lol... then again, it's A LOT more fun than coughing up $$$ for smokes!
It's great to hear all the personal testimonials, however, I think the OP was looking for any studies regarding long term use.
I've been vaping for 4 1/2 years and I have zero negative effects to report.
Current state of knowledge about chemistry of liquids and aerosols associated with electronic cigarettes indicates that there is no evidence that vaping produces inhalable exposures to contaminants of the aerosol that would warrant health concerns by the standards that are used to ensure safety of workplaces. However, the aerosol generated during vaping as a whole (contaminants plus declared ingredients) creates personal exposures that would justify surveillance of health among exposed persons in conjunction with investigation of means to keep any adverse health effects as low as reasonably achievable. Exposures of bystanders are likely to be orders of magnitude less, and thus pose no apparent concern.