The oldest evidence of psychoactive cannabis use may have emerged from a 2,800-year-old royal tomb in southern Siberia. Archaeologists discovered more than 1,000 cannabis seeds alongside preserved human hair containing chemical traces associated with the plant's intoxicating compounds.

The remarkable discovery offers a glimpse into the mysterious burial rituals of the ancient Scythians. These horse-riding peoples dominated much of the Eurasian steppe during the Iron Age.

Even more surprising, the findings predate the famous Greek historian Herodotus's descriptions of Scythian cannabis rituals by roughly three centuries.

But did these ancient people actually get high? And what role did cannabis play in ceremonies surrounding their dead?

A new scientific investigation offers intriguing answers. However, it also raises questions that researchers have yet to resolve.

A Royal Tomb Hidden in the Siberian Steppe

Deep in southern Siberia's Uyuk Valley lies Tunnug 1, an enormous ancient burial mound in Russia's Republic of Tyva.

The mound measures approximately 460 feet (140 meters) across. It belonged to high-ranking members of Scythian society, a culture renowned for horsemanship, warfare, and elaborate burial customs.

Archaeologists began excavating the site in 2017. Over successive field seasons, they uncovered weapons, horse equipment, decorative objects, and evidence of elaborate funerary ceremonies.

The burial mound also contained human remains and numerous horses. Together, these discoveries suggest that the Scythians staged extraordinary rituals to honor powerful members of their society.

Yet some of the most revealing discoveries were almost invisible.

Among the archaeological remains, researchers identified tiny cannabis seeds. They also recovered preserved human hair from the central burial chamber.

Those two discoveries would eventually transform the investigation.

More Than 1,000 Cannabis Seeds Reveal an Ancient Connection

An international research team, led by archaeologist Gino Caspari of the University of Bern, examined the plant remains.

The team recovered more than 1,000 cannabis seeds from the burial complex.

To establish their age, researchers directly radiocarbon-dated six seeds. Their results placed the material in the early eighth century BCE.

That makes the cannabis approximately 2,800 years old.

The dating matters because archaeologists can sometimes struggle to determine when ancient plant material entered a burial site. Directly dating the seeds strengthens their connection to the original funerary context.

However, cannabis seeds alone cannot prove intoxicating use.

For thousands of years, people have valued cannabis for several practical purposes. They harvested its fibers, used its seeds as food, and produced oil.

Therefore, finding cannabis inside a tomb doesn't necessarily mean someone consumed it as a drug.

The seeds might have served as offerings, ritual materials, or valuable possessions associated with the deceased.

Fortunately, researchers had another source of evidence.

And that evidence came from the people buried inside the tomb.

Ancient Human Hair Contains Chemical Clues

Human hair can preserve traces of substances a person encountered during life. Forensic scientists sometimes use this property when investigating exposure to drugs and other chemicals.

The research team applied sophisticated chemical techniques, including high-resolution mass spectrometry, to hair from the central burial chamber.

Their findings revealed signals consistent with cannabinol (CBN) in several samples.

CBN is particularly interesting because it can form when tetrahydrocannabinol (THC), cannabis's principal intoxicating compound, undergoes oxidation.

Researchers also identified weaker molecular signals consistent with THC.

The combination of preserved cannabis seeds and cannabinoid-related traces in human hair provided a compelling archaeological connection.

Unlike ordinary plant remains, the hair samples potentially offered evidence of human exposure to cannabis compounds.

The researchers interpreted the results as evidence that people associated with the burial had consumed cannabis for its psychoactive effects.

Their findings appeared in the November 5, 2026, issue of the journal Science, in a study titled Direct evidence for psychoactive cannabis use 2800 years ago.

Still, the chemical evidence does not answer every question.

Does the Hair Analysis Prove Someone Got High?

Not completely.

The researchers identified chemical signatures associated with cannabis, but they could not reconstruct an individual's experience.

The samples do not establish how much cannabis someone consumed. They also cannot demonstrate the intensity of any intoxicating effect.

Furthermore, some independent experts question whether the hair tests conclusively distinguish consumption from external contamination.

Forensic toxicologist Volker Auwaerter of the University Medical Center Freiburg raised this concern in comments reported by the Associated Press.

He argued that cannabis material in the burial environment might have contaminated the hair.

Other researchers offered a more favorable interpretation. Archaeologist Elisa Guerra Doce of the University of Valladolid pointed to the established use of hair analysis in archaeological toxicology.

Consequently, the results represent important evidence, but their interpretation remains open to scientific scrutiny.

Did the Ancient Scythians Smoke Cannabis?

One of the discovery's most fascinating mysteries concerns how the Scythians consumed cannabis.

Did they burn it and inhale the smoke? Did they heat it to produce vapor? Or did they prepare an intoxicating food or drink?

The new study cannot determine the answer.

Although chemical compounds can enter hair after cannabis exposure, those traces do not reliably reveal the method of consumption.

The researchers therefore cannot establish whether the Scythians inhaled cannabis or consumed it in another form.

Nor can they determine the strength of the ancient plants.

The seeds may have come from wild cannabis. However, the study cannot establish whether people deliberately cultivated stronger varieties.

To understand why researchers suspect inhalation, we must look at another famous archaeological discovery.

An Earlier Discovery in China's Pamir Mountains

In 2019, scientists published evidence of ancient cannabis burning at the Jirzankal Cemetery in western China.

The cemetery dates to approximately 500 BCE, or about 2,500 years ago.

Archaeologists discovered wooden braziers containing burned residues and heated stones. Chemical analysis identified cannabinoid-related compounds, including CBN, in the material.

These findings suggested that ancient communities burned cannabis during funerary ceremonies.

Researchers described the discovery in a study published in Science Advances.

The distinction between the two discoveries matters.

At Jirzankal, residue on burning equipment indicated cannabis inhalation. At Tunnug 1, preserved human hair offered evidence associated with exposure or consumption.

Additionally, the Siberian material dates roughly 300 years earlier.

Together, these discoveries help archaeologists reconstruct the long history of psychoactive plants in Central Asia.

Herodotus Described Scythian Cannabis Rituals Centuries Later

The new discovery becomes even more interesting when compared with an ancient Greek account.

During the fifth century BCE, the historian Herodotus wrote about the customs of the Scythians.

In Book IV of The Histories, he described people constructing enclosed spaces with felt coverings. They then threw hemp onto heated stones, producing thick vapor.

According to his account, participants celebrated the experience enthusiastically.

Herodotus presented the activity as part of a cleansing custom associated with funeral practices.

For generations, historians debated how accurately his descriptions reflected real Scythian traditions.

After all, ancient writers occasionally exaggerated unfamiliar customs.

Now, archaeological discoveries provide independent evidence that cannabis played a role in funerary settings across parts of ancient Central Eurasia.

However, the new Siberian burial does not prove that the people at Tunnug 1 practiced Herodotus's exact ritual.

The tomb predates his account by centuries. Moreover, Scythian cultures occupied different regions and developed distinct traditions.

Nevertheless, the discoveries make his descriptions more intriguing.

Something that once seemed like an unusual ancient anecdote now has a broader archaeological context.

Cannabis, Horses, and the Darker Side of Scythian Burial Rituals

The cannabis discovery did not occur in an ordinary cemetery.

Tunnug 1 belonged to an elaborate burial complex associated with powerful individuals. Archaeologists uncovered evidence of extensive horse sacrifices.

Earlier investigations identified 18 horses arranged around the mound. Subsequent excavations revealed several dozen additional horse remains.

Researchers also discovered scattered human bones.

These findings have led archaeologists to consider the possibility of human sacrifice during some burial ceremonies.

The combination of lavish grave goods, sacrificed animals, and potentially sacrificed people highlights the importance of funerary displays among Scythian elites.

Could cannabis have played a part in these ceremonies?

Possibly.

Researchers believe the plant likely held ritual significance. Its presence alongside the burial evidence supports that interpretation.

However, the precise purpose remains unknown.

Some have speculated that cannabis might have helped calm people during frightening ceremonies, including potential human sacrifices.

There is no direct evidence that the Scythians used cannabis to sedate sacrificial victims.

The discovery cannot identify who participated in every ritual or explain why they consumed the plant.

For now, the relationship between cannabis, burial ceremonies, and possible intoxication remains a fascinating historical question.

Why This May Be the Oldest Evidence of Psychoactive Cannabis Use

Humans have cultivated and used cannabis for thousands of years.

Archaeological discoveries across Asia reveal a long history of hemp fibers, seeds, and other plant products.

But identifying cannabis use for practical purposes differs from demonstrating that people sought its intoxicating properties.

This distinction explains the importance of the Tunnug 1 discovery.

The researchers combined two unusually valuable forms of evidence:

1. Directly dated cannabis seeds: These establish the plant's presence in the burial context during the early eighth century BCE.
2. Chemical traces in preserved human hair: These provide evidence that researchers associate with cannabis exposure and possible psychoactive consumption.

That combination makes the discovery particularly significant.

It also moves the archaeological discussion of cannabis intoxication several centuries further into the past.

Still, the discovery does not mean cannabis first appeared 2,800 years ago. Nor does it prove that no earlier civilization used the plant for mind-altering effects.

Instead, it provides the oldest directly dated archaeological evidence currently identified for such use, according to the research team.

Future discoveries could push that timeline back even further.

Ancient Cannabis DNA Could Reveal More Secrets

The investigation is far from finished.

Researchers have begun analyzing genetic material preserved in some of the ancient cannabis samples.

According to the University of Bern, DNA preservation is exceptionally good.

That creates an opportunity to investigate the plant's history in greater detail.

For example, genetic comparisons may eventually help researchers understand how ancient cannabis populations spread across Eurasia.

They might also clarify relationships between wild plants and cultivated varieties.

One especially intriguing question concerns whether ancient communities deliberately selected plants with stronger psychoactive properties.

The current evidence cannot answer that question.

However, additional genetic studies could provide clues about when and how humans began shaping cannabis for different purposes.

The same tiny seeds that revealed an ancient burial tradition may eventually illuminate thousands of years of agricultural history.

Frequently Asked Questions

What is the oldest evidence of psychoactive cannabis use?

Researchers studying the Tunnug 1 tomb in southern Siberia identified cannabis seeds and cannabinoid-related chemical traces in preserved human hair. They date the seeds to approximately 2,800 years ago. The research team considers this the earliest directly dated archaeological evidence of intoxicating cannabis use, although some experts dispute the interpretation of the hair analysis.

Did Scythians smoke cannabis?

Historical accounts and later archaeological discoveries suggest that some Scythian or neighboring Central Asian communities inhaled cannabis vapor or smoke. However, the Tunnug 1 findings cannot establish how the people associated with that burial consumed cannabis.

Was cannabis used before 2,800 years ago?

Yes. People used cannabis for fibers, seeds, oil, and other purposes thousands of years earlier. The Siberian discovery concerns evidence for psychoactive use, not the first human use of the plant.

What is the connection between Herodotus and cannabis?

Herodotus described Scythian customs involving hemp placed on heated stones beneath felt coverings. His account dates to the fifth century BCE, several centuries after the Tunnug 1 burial. Modern archaeology provides independent evidence of cannabis-related rituals, although it does not confirm every detail of his description.

A 2,800-Year-Old Mystery That Still Has Secrets to Tell

Some archaeological discoveries astonish us because of their size. Others reveal golden treasures, monumental structures, or forgotten cities.

The Tunnug 1 discovery tells a different kind of story.

Its most remarkable clues include tiny seeds and strands of human hair.

Together, they offer evidence that cannabis may have influenced ceremonial life among ancient Scythian communities far earlier than previously demonstrated.

They also remind us that human relationships with plants extend beyond food, medicine, and everyday materials.

Plants have shaped cultural traditions, religious beliefs, and the ways societies understood life and death.

Yet important mysteries remain.

Who consumed the cannabis? How did they use it? And what did it mean to the people gathered around a royal tomb nearly three millennia ago?

For now, the ancient Scythians have left us evidence of a remarkable practice—and just enough unanswered questions to keep the mystery alive.

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Sources and Further Reading

• Caspari, G., et al. (2026). Direct evidence for psychoactive cannabis use 2800 years ago. Science. Published November 5, 2026.
• University of Bern (2026). Cannabis was used as an intoxicant as early as 2,800 years ago.
• Ren, M., et al. (2019). The origins of cannabis smoking: Chemical residue evidence from the first millennium BCE in the Pamirs. Science Advances.
• Herodotus. The Histories, Book IV, Sections 73–75.
• Associated Press (2026). Seeds, preserved hair in tomb point to oldest signs of cannabis high 2,800 years ago, study suggests.