The earliest direct evidence for human consumption of cannabis as a drug has been discovered in a 2,500-year-old cemetery in Central Asia, according to a research paper published today in in the journal Science Advances.While cannabis plants and seeds have been identified at other archaeological sites from the same general region and time period—including a cannabis ‘burial shroud’ discovered in 2016—it’s been unclear in each context whether the versatile plant was used for psychoactive reasons or for other ritual purposes.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.
© NGP, Content may not reflect National Geographic’s current map policy.When chemical analysis of the braziers revealed that nine of the ten once contained cannabis, the researchers compared the chemical signature of the samples against those of cannabis plants discovered 1,000 miles to the east at Jiayi Cemetery, in burials dating from the eighth to the sixth century B.C.