ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Cannabis plant (Cannabis sativa) leaves and male flower heads. The cannabis plant is dioecious, the male and female flowers are produced by different plants. The leaves and flower heads of the cannabis plant are used to produce the drug marijuana. The plant contains the psychoactive chemical tetrahydrocannabinol, (THC). THC produces feelings of relaxation, elation and altered perception. Marijuana is an illegal drug in many countries.
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