One thing I haven’t seen in any of the reports, is this afflicting folks who took a single hit or who have been habitually smoking (whatever adulterated substance is in there)?
It may be hard for even the patient to know. They may have been vaping adulterated cartridges for a while but it was less or they may be sensitive to the additives. They could have had a day where they vaped a couple cartridges in a day when normally it would be a few puffs but had done that in the past with no problems. They can't even confirm the brands they think they are buying are what they say they are. People are taking spent cartridges and filling them to resell them. It's hard to tell on a micro or macro level who is doing it. Seems to me it could just be that CBD Oil with Vitamin E is at almost every gas station in the US so it's a reasonable cut to local dealers who are not health professionals.
It's the same problem that guy had who sniffed like 10 bags of microwave popcorn a day fresh out of the microwave because he loved the smell, lipid pneumonia.
Also the reports have said that many of the patients also vape nicotine so it's hard to tell. This looks like it's cut cannabis vape as the financial upside for it are more in line. People have had lipid pneumonia in the past from weird nicotine vape brands using oil based flavorings but that industry has an established pack of conscious producers of fairly safe products.
If it tastes weird, don't vape it. If it produces too much vapor and makes you feel like your breathing is even slightly restricted, stop vaping it. Don't vape smuggled carts from legal states if you're in an illegal state unless you are really really sure it is what you think it is. Almost anything can be in a mildly viscous amber liquid. Your lungs are your life!