Both PG and VG are water soluble. If you have oil in your lungs after vaping, you might want to switch what you're vaping.

I don't know your situation, or what testing methods you used. I have no doubt that you've had an experience that supports your claims. With that being said, I have heard, both from people on the internet, and personal friends, who have switched from smoking to vaping, and almost every story is the same: after the tar is processed out of their respiratory system, they breathe a lot better after switching to vaping.

It seems logical to me that you'd need to vape for a few months before feeling the effects of quitting smoking as the tar will take at least that long to get to the point where you would feel a difference. That's what I've heard from the people I've spoken to.

The only "vapes" I know of that have oil in them, are for marijuana. The active ingredients in marijuana are oil-soluble, so vitamin E acetate is usually used to dilute it to the desired strength. Vaping vitamin E acetate will absolutely mess up your lungs and cause permanent damage.

"Weed vapes" are generally purchased from the black markets or weed dealers, who are generally already breaking the law and don't care about customer safety. So while stuff like vitamin E acetate is never used in the vape liquid you'd buy at your local vape shop, it can, and very likely will be in vapes that are made and distributed illegally.