But when and where humans began to appreciate the psychoactive properties of weed has been more a matter of speculation than science.
Now, a team led by archaeologists Yang Yimin and Ren Meng of the Chinese Academy of Sciences in Beijing reports clear physical evidence that mourners burned cannabis for its intoxicating fumes on a remote mountain plateau in Central Asia some 2500 years ago.
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Andrew Lawler ~ ScienceMag.org ~