Using any borrowed cigarette, the Magician cuts it into 3 pieces with a box... then uses a blue ink pen to mark a small line onto the cut center piece... then RESTORES the cigarette back to it's original piece with the blue mark visible in the center...
#15 The Cigarette Box Trick
The box can be purchased at Magic Stores for about $20... it has a secret compartment that holds three short pieces of cigarette...
when you slide the box completely open, these are revealed and the original cigarette is hidden from view in the secret compartment
When you want to mark the center piece with an ink pen, you first slide the box open then back closed about half way slightly,
which then removes the center "dummy" piece from view and reveals the real center of the real cigarette,
which you mark with the ink pen...
then you slide the box completely closed and remove the real cigarette to show the mark!