Too sloppy to fool a smoker in the pictured scenario. Don't loosen or mess around with the cigarette's tobacco load. Just tuck in one or two toy cap gun charges, the paper wrapped kind, which are tiny, using a hairpin or tip of a metal nail file. If you are careful, you won't skew the look or feel of the cigarette. It makes a very loud bang, but won't injure the victim. We used to do it when I was a teen.