Archaeologists have uncovered remarkable evidence that humans were using marijuana for its psychoactive effects approximately 2,800 years ago, pushing back the documented history of cannabis intoxication by several centuries. An international research team examining an ancient royal burial mound in southern Siberia discovered more than 1,400 cannabis seeds alongside preserved human hair containing chemical traces associated with THC, the primary intoxicating compound in marijuana. The findings suggest that cannabis played an important role in elaborate funerary ceremonies among the ancient Scythians, a civilization known for its skilled horseback warriors, intricate gold ornaments, and complex burial traditions.
The discovery, published November 5, 2026, in the prestigious scientific journal Science, provides what researchers describe as the oldest securely dated direct archaeological evidence supporting the use of cannabis for its mind-altering properties. The study, titled Direct Evidence for Psychoactive Cannabis Use 2800 Years Ago, was led by archaeologist Gino Caspari of the University of Bern and the Max Planck Institute of Geoanthropology, working with an international team of specialists. By combining radiocarbon dating, botanical identification, archaeological analysis, and advanced chemical testing, the researchers reconstructed a previously undocumented chapter in the relationship between humans and marijuana.
The discovery is particularly significant because archaeologists have long struggled to distinguish ancient cannabis consumption from the plant’s use for food, fiber, oil, and ceremonial offerings. Cannabis seeds and plant materials have appeared at prehistoric sites across Eurasia, but their presence alone cannot establish whether ancient populations understood or deliberately sought the plant’s psychoactive effects. The Siberian findings provide a rare combination of physical plant remains and cannabinoid-related compounds in preserved human tissue, offering new evidence that ancient communities may have incorporated intoxicating cannabis into important cultural and religious practices.
Ancient Royal Tomb Discovered in Southern Siberia
The discovery occurred at Tunnug 1, an enormous burial mound in the Uyuk Valley of Russia’s Tyva Republic, a remote region of southern Siberia near the borders of Mongolia. The valley is sometimes called the Valley of the Kings because of its concentration of monumental burial mounds associated with early Scythian societies. Tunnug 1 measures approximately 140 meters, or 460 feet, across and ranks among the oldest known monumental royal burial sites connected to the Scythian cultural tradition. Excavations beginning in 2017 revealed wooden burial chambers, elaborate grave goods, weapons, bronze decorations, horse equipment, and other artifacts indicating that the site belonged to individuals of considerable social importance.
The Scythians were interconnected populations of horse-riding communities that occupied vast areas of the Eurasian steppe during the first millennium BCE. Their military skills, mobility, animal-style artwork, and elaborate burial customs made them influential across regions stretching from Central Asia toward the Black Sea. The individuals buried at Tunnug 1 belonged to an early Scythian cultural tradition associated with the Arzhan archaeological horizon. Excavations have identified several wooden burial structures containing the remains of high-status individuals, surrounded by evidence of extensive ceremonial activities. The scale of the monument suggests a society capable of organizing considerable labor and resources for the burial of its elite, while the presence of cannabis introduces a new dimension to understanding how those ceremonies may have been conducted.
Archaeologists Recover More Than 1,400 Ancient Cannabis Seeds
Among the most revealing discoveries were hundreds of tiny, dark seeds scattered within and around the central burial structures. Detailed botanical examination identified more than 1,400 cannabis seeds and fragments associated with the burials, including over 1,000 substantially intact specimens. Their small size and physical characteristics suggest they originated from wild or wild-like cannabis plants rather than modern varieties selected for commercial cultivation. Although the plants may have grown naturally in the surrounding region, the concentration of seeds within the burial chambers suggests deliberate placement rather than accidental accumulation. Researchers believe their inclusion indicates that cannabis held cultural importance within the funerary practices of the people who constructed the tomb.
To establish the age of the material, scientists used radiocarbon dating on six recovered seeds, placing their deposition in the early eighth century BCE, approximately between 800 and 760 BCE. These results are consistent with the archaeological chronology of the burial complex, supporting the conclusion that the cannabis belonged to the original funerary activities rather than arriving through later disturbances. The dating is particularly important because ancient cannabis discoveries have sometimes been difficult to connect securely to specific periods. However, seeds contain relatively little of the THC-rich resin associated with marijuana intoxication, and their presence does not independently prove psychoactive consumption. The strongest evidence emerged when researchers examined another unusually well-preserved material recovered from the same tomb: human hair.
Chemical Analysis of Human Hair Reveals Ancient Cannabis Exposure
The most compelling evidence came from preserved human hair recovered from the central burial chambers. Hair can retain chemical traces of substances encountered during life because compounds circulating through the body may become incorporated into the growing hair shaft. Its durable keratin structure can preserve molecular information long after other soft tissues have decomposed, making it particularly valuable for archaeological toxicology. Researchers examined several hair samples using high-resolution mass spectrometry, an analytical technique capable of detecting chemical signatures in extremely small quantities of material. The results revealed clear signals consistent with cannabinol, commonly known as CBN, along with weaker molecular signals matching tetrahydrocannabinol, or THC.
CBN is particularly relevant because it can form when THC undergoes oxidation and degradation over time. The identification of cannabinoid-related compounds in human hair, combined with cannabis seeds recovered from the same burial context, led the researchers to conclude that the individuals may have been exposed to marijuana for its intoxicating properties. Unlike the seeds alone, the hair findings offer potential evidence of direct human exposure to cannabis compounds. However, the analysis could not establish how much marijuana the individuals consumed, whether exposure occurred through inhalation or ingestion, or whether the detected compounds entered the hair before burial. Those uncertainties remain important when interpreting the discovery as evidence of ancient cannabis intoxication.
Marijuana May Have Played a Role in Elaborate Funeral Rituals
The archaeological setting suggests that cannabis may have been connected to religious ceremonies or funerary traditions rather than ordinary daily consumption. Tunnug 1 contains evidence of extensive animal sacrifice, including the remains of numerous horses arranged around burial structures. Earlier investigations documented 18 horses associated with the complex, while subsequent excavations revealed several dozen additional sacrificed animals. Archaeologists also discovered scattered human remains that may indicate human sacrifice, although the circumstances surrounding those deaths have not been conclusively established. These discoveries suggest that the burial ceremonies involved elaborate symbolic practices, potentially intended to honor powerful individuals, communicate with spiritual forces, or accompany the deceased into an imagined afterlife.
One hypothesis raised by the research team is that cannabis could have been used to calm individuals participating in ceremonies that involved human sacrifice. The plant’s psychoactive properties might have altered emotional states or helped participants endure frightening or physically demanding rituals. However, there is no direct evidence establishing that cannabis was administered specifically to sacrifice victims, and the identities of the people represented by the hair samples remain uncertain. Other possibilities include communal intoxication, religious trance, ceremonial purification, or the use of cannabis by mourners and ritual specialists. The findings support a connection between marijuana and the burial context, but the precise cultural meaning of its use cannot yet be determined.
Discovery Supports Ancient Accounts of Scythian Cannabis Use
The Siberian evidence adds archaeological support to historical descriptions of cannabis use among ancient Scythian populations. In the fifth century BCE, the Greek historian Herodotus described Scythians performing purification rituals involving hemp and heated stones. According to his account in The Histories, participants entered enclosed spaces and placed hemp material onto hot stones, producing vapors that they inhaled during ceremonial activities. Although the accuracy of individual details remains difficult to establish, the description has long attracted attention because it suggests that cannabis intoxication was familiar to certain populations of the Eurasian steppe more than 2,400 years ago.
Previous archaeological research provided important support for the broader historical picture. In 2019, researchers publishing in Science Advances identified cannabinoid residues in wooden braziers recovered from Jirzankal Cemetery in the Pamir Mountains of western China. The cemetery dates to approximately 500 BCE, and chemical analysis indicated that cannabis plants had been burned during funerary ceremonies. The discovery provided strong evidence for ritual cannabis inhalation about 2,500 years ago. The new Siberian findings extend the proposed archaeological record of psychoactive use approximately 300 years further into the past. Together, the discoveries suggest that cannabis held a ceremonial role across parts of Central Eurasia centuries before the emergence of modern recreational and medical marijuana systems.
Scientists Caution That Important Questions Remain Unanswered
Despite the significance of the discovery, independent specialists have raised questions about whether the hair analysis conclusively demonstrates cannabis consumption. Volker Auwärter, a forensic toxicologist at the University Medical Center Freiburg in Germany, questioned whether the reported chemical findings adequately distinguish internal consumption from external contamination. Because the hair was recovered from a burial environment containing cannabis seeds, cannabinoids or their degradation products might theoretically have reached the samples through environmental exposure rather than ingestion or inhalation during life. The distinction matters because identifying cannabis-related molecules in ancient human remains does not necessarily establish that those molecules entered the body through active drug use.
Other researchers have interpreted the results more favorably. Archaeologist Elisa Guerra Doce of the University of Valladolid in Spain, who studies psychoactive substances in prehistoric societies, has emphasized that toxicological analysis of ancient hair is an established archaeological approach. Supporters of the study’s interpretation consider the combination of botanical remains, chemical findings, and funerary context particularly persuasive. Nevertheless, the research cannot establish the potency of the ancient cannabis, how frequently it was consumed, or whether individuals experienced intoxication comparable to that produced by modern marijuana products. The strongest conclusion is that the discovery provides unusually early evidence consistent with psychoactive cannabis exposure, while further testing may be needed to resolve alternative explanations.
Ancient Cannabis Could Reveal New Details About Marijuana Domestication
The discovery may also provide valuable information about the origins and evolution of cannabis cultivation. Archaeological and genetic research suggests that humans began using cannabis in Asia thousands of years before the Siberian burial took place, initially exploiting its seeds and fibers for food, oil, textiles, and other practical purposes. Some genetic studies have proposed that cannabis domestication began in East Asia approximately 12,000 years ago, although the precise location and chronology remain subjects of continuing investigation. The transformation from useful wild plant to deliberately cultivated crop likely involved numerous communities, generations of selection, and different preferences for fiber production, seed yield, and chemical composition.
The small seeds recovered from Tunnug 1 resemble those of wild or wild-like cannabis, raising questions about whether the plants were gathered from natural populations or deliberately cultivated. Their physical appearance does not establish the THC concentration of the original plants, and the study provides no evidence that ancient Siberian communities were breeding cannabis specifically for stronger intoxicating effects. However, the exceptional preservation of the botanical material offers an opportunity to investigate the genetic characteristics of ancient cannabis populations. Researchers have already begun sequencing DNA extracted from some of the recovered specimens, potentially providing new evidence about the movement, cultivation, and genetic diversity of cannabis across prehistoric Eurasia.
New Research Could Rewrite the Early History of Marijuana
The Tunnug 1 discovery demonstrates how modern scientific techniques can reveal information that traditional archaeological excavation alone cannot establish. Tiny seeds overlooked during earlier periods of archaeological research can now be identified through detailed botanical analysis, while chemical instruments can detect molecular signatures in human remains preserved for thousands of years. Combining these techniques with radiocarbon dating allows researchers to investigate not only whether ancient societies encountered cannabis but also when, where, and under what circumstances the plant may have been used. Further analysis of human hair, plant material, burial arrangements, and genetic evidence could help distinguish ceremonial consumption from other possible uses.
Future investigations may also uncover older evidence of cannabis intoxication elsewhere in Eurasia. Because marijuana plants can grow naturally and have been cultivated for thousands of years, it is possible that humans recognized their psychoactive properties long before the eighth century BCE. The absence of earlier definitive archaeological findings does not mean cannabis intoxication began in Siberia. Rather, the newly discovered material represents an important point in the documented history of cannabis use. As researchers improve methods for identifying ancient cannabinoids and recover better-preserved botanical specimens, the timeline may shift again.
For now, the discovery provides a remarkable glimpse into a society that existed nearly three millennia before modern cannabis legalization debates. The people buried at Tunnug 1 lived in a world shaped by horseback mobility, elaborate spiritual traditions, and strong connections between human communities and the natural environment. Cannabis appears to have been one of the plants involved in that cultural landscape, potentially serving purposes that extended beyond food and fiber into ritual experience and altered consciousness. Although questions remain about the exact method and meaning of its use, the Siberian findings substantially deepen scientific understanding of humanity’s long relationship with marijuana and offer a compelling new chapter in the ancient history of cannabis.
