Chemical traces on 2500-year-old wooden braziers are the earliest evidence that people had begun growing mutant marijuana strains that could make them stoned
Source:
https://www.newscientist.com/article/2206431-tombs-in-china-reveal-humans-were-smoking-cannabis-2500-years-ago/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home