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marijuana
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Marijuana
The chemistry of marijuana
saliva test for cannabis
Map of the United States displaying the legal status of marijuana by state as of late 2024. States where marijuana is legal for adult use are shaded green, states where it is illegal are shaded orange, and states with conditionally decriminalized possession are marked with a lighter orange. Additional symbols indicate where marijuana is legal for medicinal use or where only low-THC medicinal use is permitted. marijuana plants Marijuana (Cannabis sativa) with (left) male plant, (right) female plant
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The chemistry of marijuana
Learn about the chemistry of marijuana and how its potency and safety is determined.
Video: © American Chemical Society (A Britannica Publishing Partner)
saliva test for cannabis
Saliva testing for cannabis could someday help identify impaired drivers.
Video: © American Chemical Society (A Britannica Publishing Partner)

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Marijuana
Buds and leaves of female marijuana (Cannabis sativa) plants.
Courtesy of Prairie Plant Systems
The legality of marijuana in the United States
A map of the United States showing the legality of marijuana.
Encyclopædia Britannica, Inc./Kenny Chmielewski
marijuana plants
Marijuana (Cannabis sativa).
John Kohout—Root Resources/Encyclopædia Britannica, Inc.
Marijuana (Cannabis sativa) with (left) male plant, (right) female plant
H. Matsuura--B.W. Halstead, World Life Research Institute
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