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  1. Opium - Wikipedia

  2. Opium | Drug, Physiological Actions, & History | Britannica

  3. Opium - DEA.gov

  4. Opium: Uses, Addiction Treatment & Side Effects - Drugs.com

  5. Heroin, Morphine and Opiates - Definition, Examples & Effects - HISTORY

  6. Opium poppy | Description, Drugs, & Seeds | Britannica

  7. opium summary | Britannica

  8. Opium - Alcohol and Drug Foundation

  9. Opium - Drug Fact Sheet - DEA.gov

  10. Opium - prod9.dea.gov