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Opium - Wikipedia
Opium Effects: Short and Long-Term Impact on the Human Body
Opium | Drug, Physiological Actions, & History | Britannica
Opioids: What They Are, Side Effects & Disorders - Cleveland Clinic
Opium - DEA.gov
How Opioids Affect the Brain: Immediate and Long-Term Effects - Healthline
Opium (Oral Route) Side Effects - Mayo Clinic
Avicenna: effects of opium on sensation and pain - The Lancet
Opium: Uses, Addiction Treatment & Side Effects - Drugs.com