- Scientists Find Ancient Humans Used Weed 2,500 Years Ago, Too The New York Times
- Oldest evidence of marijuana use discovered in 2500-year-old cemetery in peaks of western China Science Magazine
- People Smoked Pot to Get High at Least 2,500 Years Ago Live Science
- The origins of cannabis smoking: Chemical residue evidence from the first millennium BCE in the Pamirs Science Advances
- Using Marijuana to Get High Dates Back Millennia Scientific American
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