The excavation of a 2,500-year-old ancient tomb in western China has revealed the earliest and clearest evidence of human use for its physiological and psychological characteristics.

Scientists from China and Germany have analyzed many pieces of chipped wood and stones from the tombs in the tomb and the results show that the material is suitable for the chemical properties of the solid-state especially with a large amount of tetrahydrocannabinol (THC) - the most powerful neurotransmitter in plants.

The results of the study were published on June 12 in the journal Science Advances, suggesting that thousands of years ago, it could have been used in burial rites, and considered a way. to contact the Go‌d or the dead.

However, it seems that the ancient people did not smoke as much as today. Most likely, they only use as incense, burning in enclosed space.

Nicole Boivin, director of the Max Planck Institute for Human History and History and author of the report, said she was burned on hot stones inside a wooden charcoal stove, carrying case. hot coal. "This is the only method for people to use it at that time," she said.

10 coal kilns were found in the Jirzankal cemetery in the Pamir Mountains near the Chinese border with Pakistan.

Plants are grown in East Asia to get seeds and fiber at least from 4,000 BC. However, the original varieties, as well as most wild populations, have low levels of THC and other contaminants.

Many historians have put the source of smoking on the ancient Central Asian prairies, but these arguments are based on a passage from the end of the first century BC, written by Greek historian Herodotus.

The authors of this latest study provided the first concrete evidence of the use of the device in ancient times, although it is unclear whether those buried in the Jirzankal Cemetery are active. planting vegetables or simply looking for plants with high levels of THC.