<prompt> Smack is the common name forHeroinCocaineOpiumNone  <response>: Heroin or di-acetyl-morphine is about two times more potent than morphine in injectable form. Apa from the parenteral mode of administration, heroin can also be smoked or chased chasing the dragon, often in an impure form called smack or brown sugar in India. Heroin is more addicting than morphine and can cause dependence even after a sho period of exposure. Ref: A Sho Textbook of Psychiatry, Niraj Ahuja, 7th Edition, pg. no. 43 