ABC - DEF - GHI - JKL - MNO - PQRS - TUV - WXYZ Heroin
Similar term(s): skag, smack.
Definition:
Pain-killing drug made from the chemical morphine, which is extracted from the dried latex of the opium poppy. Heroin is extremely fast acting, and within a few seconds a small dose will give the user an instant feeling of well-being. Much larger doses can make users relaxed and drowsy.
Pure heroin is a white powder, but street heroin comes as a brownish-white powder that can be smoked, snorted or dissolved and injected.
Source & ©: GreenFacts, based on bbc.co.uk
A to Z of Drugs 
More:
Effects of prolonged use include long-term changes in certain brain receptors, and changes in learning and in the response to stress.
Source & ©: GreenFacts Digest on WHO
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