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Cannabis smoking (known colloquially as smoking weed or smoking pot) is the inhalation of smoke or vapor released by heating the flowers, leaves, or extracts of cannabis and releasing the main psychoactive chemical, Δ 9-tetrahydrocannabinol (THC), which is absorbed into the bloodstream via the lungs.
The history of cannabis and its usage by humans dates back to at least the third millennium BC in written history, and possibly as far back as the Pre-Pottery Neolithic B (8800–6500 BCE) based on archaeological evidence.
Apr 19, 2019 · Cannabis is the most frequently used illicit substance in the United States. Find out about the history of marijuana use, the chemistry behind a "high", and ...
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- National Geographic
May 31, 2017 · The history of cannabis cultivation in America dates back to the early colonists, who grew hemp for textiles and rope. Political and racial factors in the 20th century led to the...
Find out how, as marijuana became ingrained in youth culture, a political campaign pushed back to designate the drug a danger to public health in this clip from The Marijuana Revolution.
