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  1. Drug addiction (substance use disorder) - Symptoms and causes

  2. Substance abuse - Wikipedia

  3. DrugFacts | National Institute on Drug Abuse (NIDA)

  4. Drug | Definition, Types, Interactions, Abuse, & Facts

  5. Understanding Drug Use and Addiction DrugFacts

  6. Addictive Substances: What They Are, Effects & Types - Cleveland …

  7. Commonly Used Drugs Charts | National Institute on Drug Abuse

  8. Drug Use and Addiction - MedlinePlus

  9. Articles about Substance Use Disorder | NIH MedlinePlus Magazine

  10. Drugs (psychoactive) - World Health Organization (WHO)