Not to put a damper on things but it has been said for a long time vaping cinnamon flavor is a bad idea
From Kurt as far back as 2011
"That said, the dangers I see from cinnamon
vaping have nothing to do with the liver, but from cinnamaldehyde itself. This is a KNOWN lung and mucus membrane irritant and can cause ulcers and lung damage. I know chewing too much cinnamon gum will give me mouth sores. There are many posts here in the Health Forum related to throat, mouth and lung problems from vaping cinnamon e-liquid. To honest, I don't think cinnamon e-liquid should be sold, or else it should have a warning. Some are fine with it, but many get severe reactions that can become quite scary. In almost all cases, the vaper thought it was vaping in general causing the problems, then someone asks what the juice was, and it was Cinnabomb or some such hot cinnamon juice.
As I said, some do not have any obvious issues with cinnamaldehyde, but the compound does have a long history of causing such problems. I avoid hot cinnamon, as it will also cause a flair up of Crohn's disease, which I have and have to watch diet for."
Do you vape cinnamon flavors? Read this!
and If you do search here there are quite a few threads concerning vaping cinnamon since then.