ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY
Cannabis flower. The leaves and flower heads of the cannabis plant (Cannabis sativa) are smoked or eaten as the drug marijuana. The leaves contain a 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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