LAWRENCE MIGDALE / SCIENCE PHOTO LIBRARY LAWRENCE MIGDALE / SCIENCE PHOTO LIBRARY
An addict injecting himself with heroin. Heroin (or diamorphine) is a narcotic analgesic drug. It exists as a white crystalline powder, which is liquefied by heating prior to injection. The user's arm is covered by track marks in the region of the veins, a result of repeated injections.
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