IR camera for tobacco smoke escape detection? Does anyone know the right kind of IR camera to rent or...

Does anyone know the right kind of IR camera to rent or purchase to detect tobacco smoke leak in a home?
Does a 100 pound propane container weigh 100...
Answers:    possibly right here http://www.youtube.com/watch?v=EeJ1c9YOz...
Would it be more cost powerful to disappear...
IR cameras detect temperature. I'm not aware of how to use one to detect smoke. I would depressurize the home/room you want to experiment with a roomy window adherent, then use something approaching incense burner & follow smoke from suspect cracks/gaps.