I'll tell you something I find strange... it is my understanding that smoker's COPD is irreversible and lung degradation continues for the rest of your life. If that is the case, and considering that on this site, for example, we have over a quarter of a million smokers and ex smokers, all along the spectrum of COPD, from mild to severe, then I would have expected to see numerous reports of people having continued lung difficulties, even after quitting smoking. And, of course, the way people generally incorrectly relate correlation to cause, I would expect to see hundreds of people here complaining about continuing lung issues, and also of course blaming it on vaping, regardless of source.
Yet those cases here are amazingly rare. I can count on one hand the number I've read. Reports of clearer lungs are almost universal.
It absolutely defies belief that there is some Silent Epidemic of BO happening in the vaping community. Quite the opposite, vaping more resembles some sort of miracle cure, if all the hand wringing over COPD are correct. Maybe it is, maybe inhaling an antibacterial/antiviral all day long does some miracle work.
I was a 2 PAD smoker for about 20 years who suffered from asthma, I was using a 200 puff inhaler once a month. Since I've started vaping even with diketones the same inhaler now lasts me 4-5 months. That is the evidence I look at to tell me if vaping is better for me not some study from people that absolutely do not have my best interest at heart.