BOB EDWARDS / SCIENCE PHOTO LIBRARY BOB EDWARDS / SCIENCE PHOTO LIBRARY
Opium and marijuana plants. White opium poppies, Papaver somniferum, with marijuana plants, Cannabis sativa, in the background. The opium drug consists of the sap from the unripe seed capsules of the plant. It is used medicinally for the pain- killing alkaloid drugs in it, such as morphine, heroin & codeine. It is also used as a narcotic as it brings on pleasurable dreams and visions. Mari- juana is also used medicinally and as a recrea- tional drug. Its active component, tetrahydro- cannabinol, is concentrated in the plant's flower- ing tops. It induces a feeling of passiveness in users & can also alter their perceptions. Photo- graphed in the state of Himachal Pradesh, India.
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