Time will tell, it sure smells. From 1010 WINS: Jetliner Returns To Newark After Haze In Cabin: "Sep 12, 2005 6:43 am US/Eastern
(1010 WINS) NEWARK, N.J. Officials aren't sure what caused haze to fill part of the cabin of an American Airlines jetliner soon after taking off from Newark Liberty International Airport.
Flight 1147, with 109 passengers aboard, had departed for Chicago when flight attendants noticed the problem yesterday.
The aircraft turned back and landed safely at Newark. ..."
I haven't seen anything else about this yet, I'll have to poke around and keep an eye out.