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Opium - Wikipedia
Opium | Drug, Physiological Actions, & History | Britannica
Opium - DEA.gov
Opium Wars | Definition, Summary, Facts, & Causes | Britannica
Heroin, Morphine and Opiates - Definition, Examples & Effects - HISTORY
Opium poppy | Description, Drugs, & Seeds | Britannica
Opium - Alcohol and Drug Foundation
Opium - Drug Fact Sheet - DEA.gov
Opium - prod9.dea.gov
Opium: Uses, Addiction Treatment & Side Effects - Drugs.com