What it enables you to do is to form your hand into a fist, with the thumb sticking out, like a pipe. You suck on your thumb, and blow out clouds of real smoke. Plenty of big puffs. Then show your hands empty.
The gimmick uses a real cigarette stub for the smoke feature, and would not be suitable for non smokers. It is also not for use by minors.
If you smoke, and want something different, this is good value for your money. Made in wood and copper, this comes complete with instructions.