Originally posted by: tcsenter
I think the closest I came to blowing myself up was when I was in college. I worked night security at the plant where they made minuteman missles. There's literally bunkers filled with tons of drying explosive material that you have to drive around to check the temperature an humidity on. One of the other security guys was smoking near one. Estimates were that if the place went up it would destroy half the town it was located in.
The vast majority of high explosives, particularly those which are produced by extrusion or casting, are not sensitive to small open flames like matches, lighters, or cigarettes. You can drop them, throw them, step on them, hold a lighter to them, and nothing will happen.
They would require a much more intense heat source or a very rapid change in temperature than a cigarette can accomplish in order to promote detonation.
That said, there can be some nasty by-products and volatile chemicals which might 'exude' from high explosive compounds, and unless you're absolutely 100% certain of what you're dealing with, its best not to go around trying to prove or disprove what I just stated.
Black and flash powders are an entirely different animal. They readily ignite with shock, friction, open flame, or even sparks.