Don't know anything about this site/organization, or science for that matter, but this seems to explain it somewhat.
https://www.acsh.org/news/2019/09/10/everything-goes-pot-myths-are-driving-fda-cdc-vaping-policy-14278?fbclid=IwAR0dO0bpv7HjINXcnGIrZ_id_itvJoH006h8FyWcsMg6ubckL0Dr6ovAMlU
https://www.acsh.org/news/2019/09/10/can-chemistry-explain-vaping-lung-14277
There have been several stories in the media recently about vapers who either became sick or died. What's going on? A lot of different things that are all being (improperly) lumped together.
In one instance, a vaper suffered a collapsed lung. But as Dr. Chuck Dinerstein explained, that has nothing to do with vaping. Several hundred others have developed severe respiratory problems, and five have died. The vast majority appear linked to vaping THC-infused oil or some other product purchased off the street.
THC is not soluble in water, so it has to be dissolved in oil. The oil of choice is vitamin E acetate. That sounds nice -- we add vitamin E to hand lotion -- but vitamin E is meant to go in your stomach, not your lungs. Inhaled oil can trigger lipoid pneumonia. (For the chemistry behind this phenomenon, read my colleague Dr. Josh Bloom's article.) Similarly, products purchased from the local black market may contain chemicals that are unsafe.