Heroin: MedlinePlus
Heroin – Surrey Drug and Alcohol Care
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Heroin
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Heroin - Alcohol and Drug Foundation
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Heroin—What Is it and Why Is it Used?
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Five things you didn’t know about heroin | CNN
Heroin | National Institute on Drug Abuse (NIDA)
INCCCCC - BBC News
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The risks and effects of heroin - spunout