Actually, as I already mentioned, there are cases with flavoring additives and other chemicals in the vape causing lung disease and other problems. I don't have it offhand but google should help you.

My sentiment is more about where I think the research will go.

Popcorn Lung is the only thing I've seen in my research

https://www.cdc.gov/niosh/topics/flavorings/

I'd be interested to hear of more.

I think that is kind of the major one that sticks out in my mind. But, its just more sinister then that IMO. Being that it is something newer, I have a feeling more will pop up.

I was friends with a major twitch streamer who used to vape literally 24/7, every stream. He got esophageal cancer and died after fighting it for ~1-2 years, roughly around age of 23. Now, obviously this is anecdotal, and obviously it could have just been bad luck/other factors/coincidence. But, I have always raised an eyebrow towards vaping since then. The only forms I consider safer with minimal consequence is dry herb based vaping with convection heat --- See silver surfer vapes for example.