From what I remember from some of my Navy Engineering training (your tax dollars hard at work), similar results come from some refrigerants being exposed to high temps.
In fact, sailors working in spaces where refrigerant might be leaking from reefer/cooler compartments are warned not to ever try and sneak a cigarette. I guess while inhaling a puff, the lit cigarette end gets super hot, hot enough to turn leaking refrigerant into phosgene, too. Nothing like going for a little nicotine hit and getting a hit of chemical warfare. (Yep, phosgene, along with mustard gas, were the gases of choice of the German army during WWI.
'86 D110 3-door
'97 D90SW - SOLD SEP '14
'94 D90ST - SOLD MAY '13
D90s sold while assigned overseas. You're welcome America!
'06 Range Rover Sport Supercharged
'8X FankenRover D100