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  1. Drug Abuse & Addiction: Effects on Brain, Risk Factors, Signs - WebMD

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

  3. Understanding Drug Use and Addiction DrugFacts

  4. Drug addiction (substance use disorder) - Mayo Clinic

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

  6. Substance Use Disorder (Drug Abuse): Risks, Types of Drugs

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

  8. Addiction and Health | National Institute on Drug Abuse (NIDA)

  9. Substance use disorders: Get the facts and find support

  10. Substance Abuse: Drug Types, Alcohol, Tobacco, and More - WebMD