Although the fewer things you ingest the better it is for you, I haven't developed a desire to quit vaping. Smoking? Yes, I wanted to quit and tried a few times. Vaping allowed me to quit and has kept me off the cigs. I'm down from 24mg to 12mg juice. Maybe I'll go to 8 and see how that works.
Vaping is credited (theoretically) by the AMA as a possible agent in the prevent of respiratory related illnesses in vapers. I'd have to find the article, but it appeared about a year ago. PG vapor is introduced into the air through HVAC systems on a regular basis in hospitals to capture airborne particles, bacteria, and viruses. The PG droplets surround the particles and weigh them down to the floor where floor cleaners take them away in the wash water. Hospitals also use PG fog in breathing treatments to carry fog borne medicines into the lungs.
My stats may be off slightly, but a Massachusetts medical college experiment that followed thousands of volunteer vapers over a 5 year period in an evaluation designed to find out whether electronic cigarettes were detrimental to the health of vapers recently published a paper that gave vaping a relative clean bill of health. They found no harmful effects in the vapers who participated and their analysis of our vaper showed all components to be within EPA ranges for daily exposure.
Lots of info here.
Boston University Study Suggests E-Cigs Can Help You Quit | Electronic Cigarette Web
My primary physician is just about as conservative as they come. He's all about getting his patients to quit tobacco cigarettes, pipes, and cigars. When I carried my first ecig into the examining room and showed it to him, he was interested. I told him that I went from 2 PAD to about 6 cigarettes a day my first week, his eyes widened. I demonstrated it at his request and blew a cloud in his direction. When I asked him if he smelled cigarette odor, he told me he really didn't smell anything. Now, when I go in for a checkup (after quitting cigarettes completely a year and a half ago) he asks me if I'm still not smoking. I tell him I haven't even had an urge. His next question is "still using the electronic cigarette?". I say yes and he says good! He's on board completely.