Opium poppy (Papaver somniferum) flowering. This poppy is the source of opium, a narcotic resin that contains the alkaloids morphine and codeine. Thes

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Opium poppy (Papaver somniferum) flowering. This poppy is the source of opium, a narcotic resin that contains the alkaloids morphine and codeine. These are used by the pharmaceutical industry as painkillers (analgesics). Opium can be refined to yield pure heroin, an illegal drug that induces feelings of warmth and euphoria. Frequent use leads to an increase in tolerance and addiction.

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Photo credit: © PHILIPPE PSAILA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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