excavated a cemetery on the Pamir Plateau of western China that dates to around 500 BC. This is a dry, desert area and much wood was preserved.
The braziers contained a burned residue that intrigued the archaeologists, so they submitted samples for analysis by gas chromatography to figure out what it was. The results came back with a high level of cannabinol (CBN), cannabidiol (CBD) and cannabicyclol (CBL), all of which come from cannabis.
Based on what we know from Scythians at the western end of the Eurasian plain, at about the same time, cannabis was used ritually, both for funeral rites and to help induce shamanistic trance. But the line between ritual and fun has always been a blurry one.