Marijuana: oldest documented smoking was 2,500 years ago in China
Scientists have found some of earliest evidence of ritual cannabis use ever seen in the archaeological record.
In tombs in the Parmir mountains of western China, they discovered several wooden braziers with traces of THC, the most potent psychoactive agent in marijuana.
The finding indicates that people smoked highly potent strains of marijuana for ritual and religious purposes at least 2,500 years ago.
Cannabis was first cultivated as a crop in Eurasia more than six millennia ago, but was not initially used for its psychoactive properties.
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