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An international team of researchers analyzed the interiors and contents of 10 wooden bowls excavated from burials at Jirzankal Cemetery, a site on the Pamir Plateau in what is now far-western China. The bowls contained small stones that had been exposed to high heat, and archaeologists identified them as braziers for burning incense or other plant matter.
Chemical analysis of the braziers revealed that nine of the ten once contained cannabis.
The Jirzankal cannabis features higher levels of mind-altering compounds than have yet been found at any ancient site, suggesting that people could have been intentionally cultivating certain strains of cannabis for a potent high, or selecting wild plants known to produce that effect.