Heroin is a highly addictive drug that produces a euphoric effect and relieves pain (analgesic effect). Street heroin (often containing other substances) can range from off-white to dark brown in color. There is also a “black-tar” variant that is popular in Indiana. Very often, users are not aware of precisely what they are putting into their bodies... Heroin dealers often add substances such as sugar, starch, quinine, and powdered milk to heroin to increase profits. Users are generally unaware that thisis done, which increases the risk of overdose or death.