Heroin is an addictive drug that is generated from a flower, the opium poppy, which typically grows in Mexico, South America, and Asia. Its appearance is like a brown or white powder, or a sticky black “tar.” It’s also called smack, junk, brown sugar, and horse, among other names. Effects of Heroin Heroin is a CNS (central nervous system) depressant that reduces brain function. Once heroin reaches the brain, it converts into morphine, a chemical…