the salt peter smoke bombs give off as much flames as a road flare, and will probably catch your trap on fire. i really dont recomend using it. the stuff is fun to make though, and can be used as rockets if you put it in a metal tube. its also best to melt the surgar first, then mix in the salt peter.
you can make a mini smoke machine out of a sodering iron, and a eye droper filled with the liuquid smoke stuff.