Humans have been cultivating the cannabis plant for thousands of years, but we know very little about when it was first used for its psychoactive properties.
Recently, a collection of ancient wooden incense burners—or braziers—were found at a 2,500-year-old cemetery in western China's Pamir mountain range.
This is largely because there is very little archaeological evidence of cannabis use, so scientists are limited to written records, which can sometimes be unreliable. The team collected samples of organic material from the wooden braziers and burned stones that were found inside them. They then analyzed the samples using a technique known as gas chromatography-mass spectrometry, which is capable of detecting the chemical signatures of various substances.
According to the researchers, the results reveal that cannabis was being burned on the hot stone inside the braziers and that ancient people likely inhaled the smoke during a burial ceremony in which they may have been attempting to communicate with deities or the dead.
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