Ancient usage of cannabis

Cannabis The cultivation of cannabis extends back into distant prehistory. During excavations at a cemetery on the Pamir Plateau on the border of China and Tajikistan, Ren et al. found cannabinoid oils in wooden braziers. The finding is consistent with psychoactive cannabis use in burial rituals as early as 500 BCE. The cannabis featured high levels of THC (tetrahydrocannabinol)—higher than in wild varieties of the plant. Artifacts recovered...