How to Perform a cool smoke trick with your finger

The commentator tells viewers they will learn how to make smoke from their fingertips. First you must tear the strip off of a matchbox. Then place the strip in an ashtray, facing upside down. Light the strip on fire and let it burn for a little while. Push the burned strip to one side of the ashtray and there will be a brown-yellow residue left in the bottom of the ashtray. Wipe the residue off with one of your fingers and then proceed to rub your fingers together. Smoke will then come from your fingers! However, the residue can be harmful so they tell you to make sure that you wash your hands immediately after the trick is over.