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  1. Understanding Drug Use and Addiction DrugFacts

  2. Introduction and Background - New Treatments for Addiction - NCBI Bookshelf

  3. The Science Behind Addiction | Substance Use and the Brain

  4. Addiction: What It Is, Causes, Symptoms, Types & Treatment

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

  6. Drug Misuse and Addiction | National Institute on Drug Abuse

  7. Drugs, Brains, and Behavior: The Science of Addiction

  8. What Is Addiction? Definition, Signs, Treatment, and More - Healthline

  9. Addiction - Symptoms, Treatment, and More - Verywell Mind

  10. The Landscape of Addiction - Psychology Today