I'm sure many readers have heard about smoke generators used as anti-theft devices in some stores. Here are a couple of video clips to illustrate the concept. First, a demonstration of a device in England.
Next, an actual armed robbery in South Africa, foiled by the smoke generator.
Of course, both videos were provided by suppliers of these devices, so there may be failures that they prefer not to publicize.
I've had a couple of people ask me whether I thought it was a good idea to install something like this in one's home, to drive burglars or home invaders out without their being able to steal anything. I'm not sure it is. If there's a need to evacuate the home (for example, if a fire starts, or the intruders begin shooting wildly) the smoke might prevent one finding one's own way out of the danger zone. However, if you know your home well, you can probably navigate around the corridors and to the front or back door by touch if necessary. Intruders presumably won't have that same level of knowledge, so you might be able to get away from them. (On the other hand, if they're fumbling around blindly and you walk into them, who knows what might happen?)
What say you, readers? Good idea, or a complicating factor?