ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Cannabis plant (Cannabis sativa, centre to centre right) in a garden with other 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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