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  1. What is heroin and how is it used? | National Institute on Drug …

  2. Heroin - Wikipedia

  3. Heroin: Effects, Addiction, Withdrawal Symptoms, and Treatment

  4. Heroin - DEA.gov

  5. Heroin | Opioids | CDC - Centers for Disease Control and Prevention

  6. Heroin | National Institute on Drug Abuse (NIDA)

  7. What Is Heroin? Addiction Risk, Safety, and How to Get Support

  8. Heroin: MedlinePlus

  9. What effects does heroin have on the body? | National Institute …

  10. Heroin: Effects, Addiction & Treatment Options - Drugs.com