FILE – This May 20, 2019 file photo shows marijuana plants in a grow room using green lights during their night cycle in Gardena, Calif. According to research released on Wednesday, June 12, 2019, archaeologists have unearthed the earliest direct evidence of people smoking marijuana from a 2,500-year-old graveyard in western China. (AP Photo/Richard Vogel, File)More

WASHINGTON (AP) — Archaeologists have unearthed the earliest direct evidence of people smoking marijuana from a 2,500-year-old graveyard in western China.

In a complex of lofty tombs in the Pamir Mountains — a region near the borders of modern China, Pakistan and Tajikistan — excavators found 10 wooden bowls and several stones containing burnt residue of the cannabis plant. Scientists believe heated stones were used to burn the marijuana and

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