After reading RM's post I did some more research.
Steam is pure water vapor. Two hydrogen atoms and one oxygen atom. Nothing more. Water vapor is invisible.
Other chemicals may be pushed along through the steam pipe and atomized at the outlet end of the pipe and be present in the "mist" caused by cooling water vapor.
Bottom line is probably one should not use furniture scraps for smoking unless you know where they come from, and how, and if, they were treated.