This is a awful long reaction, excuses for it, but I hope the following will help a bit, because I can understand if the vaping is a bit of concern for you in the starting fase:
I think you as an insider will understand the next: Got my first exacerbation February 2010 and learned I have a FEV1 of 37-38% and stopped smoking immediately. Started vaping march 2010. In september 2010 my FEV1 measured 42-43%. December 2011 my FEV1 measures 50% . Of course happy with the last test result, but notice; intra-individual variance of testing FEV1 can be 8% of normal FEV1, so the 50% is maybe a bit of luck, because I had f.e. a good day. However, what can be said is that I’m stable now, no further extra abnormal fast deterioration of lung function and results are shown like someone who stopped smoking; it looks like my vaping has had no negative influence on my test results et al. Test results in future will tell more. If my next 2 test results stay between 42-50% and also no exacerbations in between, it’s more certain. For now it’s promising.
Have done a pretty extensive search on “vaping” last year. Got to the conclusion that PG looks safe, VG is safe if used with in PG/VG mix (I am a high voltage vaper and 100% VG can have a small risk with high temperatures, this small risk is lowered or diminished in mix PG/VG, so I use mix 70& PG and 30% VG.) Nicotine is imo safe for lungs as long you don’t have heart or blood vessels problems, but opinions on this can differ. With COPD in stage 4 problems like these become in time an issue, but hope that stage will stay away for many, many years, or I never get there. Real concern was and is for me the flavouring in the e-liquid and not knowing “what else is maybe put in premade liquid you buy, or the maybe a to high percentages or flavourings put in them”. The inhalation of flavouring is the least studied and the completely untested part of vaping. But, thanks to the work in this field now done by Flavourart, this risk is now less risky for most of their tested products. Whatever anyone says about Flavourart with wrong or right things about them in the past, imo the last 1-2 year they fully 100% earn the leading-role: They have done some toxicological testing and since june 2010 I have vaped only their as non-toxicological tested flavours (mostly in Flavourart DIY Heaven juice traditional.) See
ClearStream by FlavourArt | ClearStream by FlavourArt For now they are the only ones in the vaping world who have done these tests as far as I know. Flavourart Dark Vapure, Cuban Supreme and their supplement-flavour Bitter Wizard come out as non-toxicological with very good test results and I like these flavours. I also use a bit of their Maxboro flavour, test results of Maxboro are good now, but I take care to stay within the 1-2% range with this flavour; to much of it can be a risk.
Further for me no risk taking with vaping; no polycarbonate tanks (I use only completely SS tanks, or glass tubes etc. in tanks), and no glassfiber or silicon wicks in DIY atomizers. I always take the safe side and do not step easy in every hyped new product in the vape world. It’s always for me first an extensive search whether the new product has no potential risk for people like us.
Hope this information helps and puts you a bit at ease. You are not alone in this. One third of people with COPD can’t stop smoking, or start smoking again after a time. That’s awful, resulting in a soon and premature death after a bad “stage 4” with a lot of suffering. It looks like for many it is not necessary to go this way and hope we can state this for sure in the future.