It must have been something in the air. During a short time window at the end of the last ice age, Stone Age humans in Europe and Asia independently began using a new plant: cannabis. Thats the conclusion of a review of cannabis archaeology, which also links an intensification of cannabis use in East Asia with the rise of transcontinental trade at the dawn of the Bronze Age, some 5000 years ago.
https://www.newscientist.com/article/2096440-founders-of-western-civilisation-were-prehistoric-dope-dealers/
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