This is a very impressive trick. The performer give a spectator a nicely lacquered metal tube with a gold top to examine. A filter tipped cigarette is then inserted into the tube and the top is replaced. The spectator is then invited to make the magic passes and when the top is removed the cigarette has vanished or changes to a very small miniature cigarette about 1 cm long and the magician comments: "At least it will help you cut down on smoking!"
This trick is very easy to do and the impact on the audience is massive.