[QUOTE=hopetoquilt;6174080]I have been told of the possible fire hazard of the plug ins.
I heard this too, but according to the websites that debunk stuff, it isn't true. I've used them for a long time and the manufacturer says they are safe.
However, I don't have an extra plug for one in my sewing room (in my basement) but my room smells clean. We run a dehumidifier so the air is fresher.