I recall watching a wave of fog moving through the cabin after they opened the door after landing on a flight from Singapore to Jakarta many moons ago (I was in First Class for the flight, very near the door - I'm sure it dissipated as it moved aft) (A300 IIRC).
Another time, again in Jakarta - this time waiting for departure to Denpasar - the Swiss lady sitting next to me started to panic thinking the fog coming out of the ECS vents was smoke. I needed to explain to her what was going on... (MD80).
Sloppy Joe is right - must have been a slow news day so they made something up...