Do you scrutinize every single package at the grocery store before putting it in your cart and then express the same moral outrage about preservatives, trans fat, sodium, sugar etc? I am pretty sure that the stuff in the Twinkie I ate or what is in my tap water is going to kill me long before what is in my juice does. Yes it is ok to be concerned, but until there is definitive and conclusive testing and proof that these substances are harmful to our lungs, making a mountain out of a molehill right now isn't going to get us anywhere except more panic.
I have vaped for the last 5 years and vaped/sub ohm'd nothing but custards for the last 3 years, and have had pretty much every breathing test available short of a large lung biopsy, and several CT's, VQ and MRI's done on my lungs in the last 8 months due to a non vaping related medical issue. Every single test/scan has shown that I have zero damage to my lungs from vaping custards, or vaping period.
The only thing my Pulmonologist said was that my lungs looked great and have healed nicely for having quit smoking 5 years ago. It is going to be a while until all the testing and reports are in. Until then, I personally see no reason to change course.
Cheers.