I thought of this a few weeks ago and something seems inherently wrong with this idea and yet when i think about it more and more i stuggle to find the problem. There are many consumer smoke bombs or similar smoke items made that produce voluminous amounts of fog from a small package. In a recent set we did at my school there was nowhere to hide fog tubes and nowhere to place a fog machine because the set was so open. This proved to be a major dilema when it came to doing certain effects, but we figured out a way. It seems to me that you could easily hide a small smoke firework and run the thin wires to basicaly anywhere so that would could ignite them remotely. These effects are legal in many places, and are very safe as it is not emiting any sparks or stars. Obviously you would still want to flame proof the surrounding area and make sure that you would not be igniting them so that the fog would be coming out directly at someones face. ANd since many of these smoke effects have lots of sulfur, i would probably check on any related allergys, but all of these are quick easy things. So i guess my questions are: 1) why do i have this gut feeling that this isn't such a good idea? 2) Would you be able to run fog out of one of these objects over some ice or dry ice and make it lie low? is this effect with fog due to temperature entirely or does it only work because of the size of the gycol molecules?