I guess I should have been more specific.
It is usually the cabinet people who start the fires. Our department worked one a few years ago where they got it above the lower explosive limit and then decided it was time for a cigarette.
Smoking does kill.
Other times it is the rags that seem to cook off about midnight thru 2am.
At the pre-dried in stage, it is usually a cigarette blown up against fresh wood.
That will burn crazy fast and hot.
You mean things like varnish, shellac and the like? That does sound rather stupid of them. It’s easy to get a dulled sense of smell to the volatiles. I guess the poor smoker got blasted, huh.