A burial mound in southern Siberia uncovered two clues that prove cannabis was used as a psychoactive substance 2,800 years ago. Archaeologist Gino Caspari and colleagues dated more than a thousand cannabis seeds and detected cannabinol in human hair from the same grave, according to a November 5 Science study. The findings push the evidence for ritual cannabis use farther back than any previously cited site.
What turned up at Tunnug 1
The site, Tunnug 1, sits in the Uyuk Valley of the Republic of Tyva and belongs to the early Scythian culture. Excavations revealed horse gear, weapons and animal imagery, while the team recovered over a thousand cannabis seeds and human hair containing CBN.
Radiocarbon dating confirmed the seeds are about 2,800 years old, and the hair shows CBN, a THC degradation product, indicating exposure to psychoactive cannabis. This combination of botanical and chemical evidence strengthens the case for ritual consumption.
Together they place cannabis in a ceremonial context and provide a chemical signal of intoxicant use. The seeds show deliberate placement, while the hair records exposure.
What the evidence can tell us about consumption
Caspari said the team cannot tell whether the cannabis was inhaled or eaten, leaving the method of use unknown. The uncertainty limits interpretations of how the plant was actually consumed.
Consequently, researchers must rely on contextual clues rather than direct usage evidence. They cannot infer method of consumption from burial context alone.
The placement of seeds suggests a symbolic role, but their exact purpose remains unclear. Thus ceremonial significance may have outweighed everyday utility.
Future excavations at non‑ceremonial sites are essential to fill these gaps. Only then can we map the full geographic spread of cannabis use.
To map the full history of cannabis use, archaeologists need comparable data from non‑ceremonial sites. This gap hinders any assessment of regional variation.
Only then can they determine how widely the plant spread across the region. Such findings will clarify the scale of ancient cannabis use.
How Siberia changes the timeline
The Siberian find dates to about 2,800 years ago, roughly three centuries earlier than the 2,500‑year‑old residues reported from Jirzankal Cemetery in western China.
Its evidence comes from seeds and hair, whereas the Chinese site relied on heated braziers and chemical residues.
Herodotus described Scythians using cannabis in the fifth century BCE, a written record that now predates the archaeological record. It also challenges assumptions that the Greek description reflects the earliest known practice.
The Tunnug 1 material provides independent physical proof, confirming the plant’s presence before the Greek historian’s account. It complements textual sources by offering physical proof.
Surviving organic material in ancient burials is rare, so the Tunnug 1 discovery is unusual and valuable. Many other sites may lack preserved seeds or hair, limiting our ability to track the practice’s deep history.
For now the find gives cannabis use a solid, dated anchor on the map and shows that southern Siberian peoples treated the plant as an intoxicant by 2,800 years ago.
