It had long been a mystery when and where varieties of cannabis plants with higher levels of psychoactive compounds were recognised and used by humans, according to the study.However, the early varieties of cannabis, as well as most wild populations, had low levels of THC and other compounds with psychoactive properties, the authors said.
The authors said this study offers the first concrete evidence for cannabis smoking in this area, although it is still unclear whether the people buried at Jirzankal cemetery actively cultivated cannabis or simply sought out higher THC-producing plants. The authors said that cannabis plants produce greater quantities of active compounds when they grow at higher elevations, and this may be why more potent plants had been discovered - and a new use initiated - by people living in high mountainous regions like the Pamirs.Although the region is remote today, it may once have sat on the Silk Road, a key trade route.
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