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  1. Opium - Wikipedia

  2. Opium Effects: Short and Long-Term Impact on the Human Body

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

  4. Opioids: What They Are, Side Effects & Disorders - Cleveland Clinic

  5. Opium - DEA.gov

  6. How Opioids Affect the Brain: Immediate and Long-Term Effects - Healthline

  7. Opium (Oral Route) Side Effects - Mayo Clinic

  8. Avicenna: effects of opium on sensation and pain - The Lancet

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