Real Christmas trees are also pretty dangerous if they don’t get watered.
PVC. Poly Vinyl Chloride. Makes a gas that can kill when burnt. But that would be in high concentrations. Also a carcinogen. The gas is. It is the same plastic as your water pipes. You know, the white plastic pipes. Don’t smoke them and you will be just fine.
Oh yeah they are! Years ago I took a real tree outside after Christmas and on a whim decided to see if all the talk about how flammable they are wasn't just exaggerated. I flicked my lighter and touched a lower branch. The tree almost instantly exploded into flames from top to bottm. Blew my mind.