Why Ancient Cultures Worldwide Independently Turned to Cannabis

Photo by Rinat Askarov via Pexels.

In 2019, a team of archaeologists working in the Pamir Mountains of western China pulled ten wooden bowls out of a burial ground called Jirzankal Cemetery. Inside those bowls were stones that had clearly been exposed to intense heat, and chemical residue that turned out to be burned cannabis. A few thousand miles away, at a Judahite shrine called Tel Arad in Israel's Negev desert, another research team had already found the same thing on a stone altar: cannabis, deliberately burned as part of a religious rite. These two sites had no trade route connecting them, no shared language, no plausible channel of contact. They didn't even overlap cleanly in time. And yet both cultures arrived at the same idea -- burn this particular plant to reach something beyond the ordinary.

The obvious question is how two unrelated civilizations landed on the same ritual practice without ever meeting. But that's actually the less interesting puzzle. The real question, one that a body of research culminating in a 2026 paper in PNAS starts to answer, is why this kept happening -- not just at these two sites, but across Scythian burial grounds, Daoist incense practice, and Silk Road cemeteries scattered across Eurasia. The emerging answer has less to do with cultural diffusion and more to do with the chemistry the plant itself was offering up, repeatedly, to anyone willing to burn it.

The Pamir Mountains: Braziers Built for Getting High

Photo by Boris Hamer via Pexels.

The Jirzankal braziers are unglamorous objects -- ten wooden bowls, blackened stones, buried around 2,500 years ago in a cemetery high in the Pamirs, a mountain range so remote it straddles the borders of what's now Tajikistan, Afghanistan, Pakistan, and China. When researchers ran chemical analysis on the residue inside them, nine of the ten bowls showed clear signatures of burned cannabis. That's not a fluke sample size; that's nearly every vessel tested coming back positive, which suggests this wasn't incidental smoke from a stray campfire but a deliberate, repeated practice tied to the burial rite itself.

What makes Jirzankal more than just another entry in the 'ancient people used weed' file is the potency angle. Earlier Central Asian sites had already produced claims of ritual cannabis burning stretching back roughly 5,000 years, but those plants were low-THC varieties -- fiber and seed-oil type cannabis, not something you'd get high from. The Jirzankal material was genetically distinct and carried unusually high THC content for its era. That's a meaningful detail, because it means someone along the way was selecting plants, whether through deliberate cultivation or careful sourcing from wild populations, specifically for their psychoactive strength. This wasn't accidental exposure to a plant that happened to be nearby. Someone wanted the stronger stuff, badly enough to seek it out.

Researchers connected to the excavation have tied the practice to funerary ritual aimed at communicating with the dead or with a spirit world beyond it -- the braziers positioned as part of the burial itself, smoke rising in a mountain cemetery as a mechanism for crossing over, or reaching whoever was already gone. Whether that framing is precisely correct is harder to prove than the chemistry, but the deliberate selection for potency backs up the idea that the psychoactive effect wasn't a side note. It was the point.

A Judahite Shrine's Holy of Holies

Photo by Mohammad Amid via Pexels.

Roughly 2,700 years ago, in the Iron Age kingdom of Judah, priests at a shrine called Tel Arad were doing something with cannabis that reads almost like a controlled experiment. Tel Arad sits in Israel's Negev desert, and its shrine included a cella -- the innermost sanctum, the holy of holies in Judahite religious architecture. On the altar inside that cella, researchers used gas chromatography and mass spectrometry to test residue and found cannabinoids: THC, CBD, and CBN all present in the burned material.

What separates Tel Arad from a lot of ancient drug-residue findings is the specificity of the setup. There were two altars in that shrine, not one. Frankincense was burned on one altar. Cannabis was burned on the other, kept distinct rather than blended into a single incense mixture. That separation matters, because it argues against cannabis showing up as some incidental ingredient in a broader incense recipe, the kind of thing that might happen if someone tossed assorted plant material onto a fire without much thought. Keeping the two substances on separate altars looks like intention -- a recognition that cannabis smoke was doing something different from frankincense smoke, and that difference was worth preserving architecturally.

There's no known trade route, diplomatic contact, or cultural exchange linking Tel Arad to the cemetery in the Pamirs, despite both practices occurring in roughly the same general era, give or take a couple centuries. Judah's priestly class and the pastoral or nomadic groups burying their dead in the high mountains of Central Asia were operating in entirely separate worlds -- different languages, different cosmologies, different everyday material culture. Yet a Judahite priest and whoever presided over Jirzankal's funerary rites were, independently, making the same basic decision: put this plant on fire, breathe the smoke, treat the result as sacred.

Scythians, Silk Road Burials, and Daoist Smoke

Photo by Jason Leung via Pexels.

Herodotus, writing in the 5th century BC, described Scythian mourners in Central Asia building small tents, throwing cannabis onto heated stones inside, and reportedly howling with pleasure at the vapor -- an account that for a long time got filed under 'ancient historian exaggeration.' Modern archaeological work has been steadily vindicating him. Frozen burial mounds at Pazyryk, in the Siberian Altai region, have produced actual cannabis remains and inhalation equipment consistent with his description, dating from roughly the 5th to 2nd centuries BC. This wasn't travelers' folklore. It was documented practice, matching physical evidence recovered more than two thousand years later.

Further east and earlier still, a cannabis burial shroud was recovered from the Jiayi Cemetery in China's Turpan Basin, dated to somewhere between 800 and 400 BCE -- cannabis plant material laid directly over or with the deceased, a different application than braziers or incense but still clearly ritual, still clearly tied to death and burial. Later on, Daoist practitioners in China developed their own tradition of mixing cannabis into incense burners alongside other botanical ingredients, inhaling the resulting smoke as part of religious and meditative practice, a use documented in Daoist texts and continued for centuries.

Line these up next to Jirzankal and Tel Arad and you get five distinct nodes scattered across Eurasia -- the Pamirs, the Negev, Pazyryk, Turpan, and the broader Daoist tradition in China -- each with its own timeline, its own religious framework, its own method of preparation. Braziers, shrouds, incense burners, mourning tents. No single trade route, migration, or missionary tradition threads cleanly through all of them. What connects these sites isn't a shared point of cultural transmission. It's that separate groups of people, working with the same plant, kept reaching similar conclusions about what to do with it.

The 2026 Science: Why Hallucinogens Keep Reappearing in Nature

Photo by Jonathan Cooper via Pexels.

A paper accepted by PNAS in May 2026 reframes this whole pattern by stepping back from archaeology entirely and asking a chemical-ecology question instead: why do hallucinogenic compounds keep showing up, independently, across plants, fungi, and even animals that share no close evolutionary relationship? The paper's argument is that these compounds function as a kind of diversified chemical arsenal -- tools that evolved, over and over, in unrelated lineages, because they serve practical biological purposes. In many cases they act as defensive agents, deterring or disorienting the animals that would otherwise eat the organism producing them. In others, they seem to manipulate herbivore or pollinator behavior in ways that benefit the plant, nudging animal behavior toward outcomes that favor the plant's own reproduction or survival.

The mechanism the paper points to is a recurrent biosynthetic 'building-block' logic -- the same basic molecular components and pathways getting reused and recombined across unrelated organisms, so that convergent evolution keeps producing structurally similar psychoactive compounds even in species with no common ancestor anywhere near this trait. It's less a story of copying and more a story of a limited molecular toolkit getting rediscovered repeatedly because it works.

That framing lines up neatly with older ethnobotanical observations: indigenous groups on different continents, with no historical contact, independently discovered psychoactive use in entirely unrelated plant families -- peyote in the Americas, iboga in Central Africa, cannabis across Eurasia, none of them related botanically. What ties these together isn't shared ancestry of the plants or shared culture among the people who used them. It's that these unrelated compounds converge on the same neurotransmitter systems in the human brain, producing recognizably similar categories of effect. The convergence, in other words, is mechanistic rather than coincidental. The right question stops being why did these cultures copy each other, and becomes why did biology keep manufacturing the same tools for humans to eventually find.

What This Means for How We Read Ancient Ritual

Photo by Magicbowls via Pexels.

The archaeological findings themselves aren't new. Jirzankal was published in 2019, Tel Arad's cannabis residue in 2020, and both have been cited and re-cited in popular science coverage ever since, often without any new data attached -- they've become the go-to examples any time someone wants to illustrate that ancient people used psychoactive substances ritually. That repetition is understandable given how solid the underlying chemistry is, but it also means the story has mostly been told the same way for half a decade: two remarkable, isolated confirmations of ancient drug use, presented side by side as a curiosity.

What the 2026 chemical-ecology research actually contributes isn't new archaeology. It's a new frame for old archaeology. Instead of treating the Jirzankal-Tel Arad parallel as a strange cultural coincidence needing an anthropological explanation -- diffusion, shared ancestral memory, some lost trade contact -- it treats human ritual convergence as one visible symptom of a much older and much bigger biological pattern. Humans didn't independently invent the idea of burning cannabis for spiritual effect through some remarkable coincidence of imagination. They were repeatedly encountering a plant that already did something specific and noticeable to the human nervous system, and repeatedly building ritual frameworks around that pre-existing effect.

That's a meaningfully different story than the one usually told. If the psychoactive compounds themselves evolved for their own chemical-ecology reasons -- defense, behavioral manipulation, whatever ecological pressure produced them -- long before any human ever burned a leaf on a stone, then the various Eurasian cultures weren't inventing ritual cannabis use from nothing. They were discovering a tool that the plant had already built. Religion's relationship to cannabis, in this reading, looks less like a cultural accident that happened to occur in multiple places and more like a predictable outcome given enough time, enough plants, and enough curious humans willing to set fire to what was in front of them.

Line up Jirzankal, Tel Arad, Pazyryk, and Turpan on a map and the temptation is to hunt for the missing thread connecting them -- some forgotten trade route, some lost priestly network passing knowledge from the Negev to the Pamirs. That thread almost certainly doesn't exist. What connects these sites is simpler and less exciting on the surface, but more interesting underneath: cannabis's own chemistry gave separate, unconnected peoples the same reason to reach for it, over and over, in different centuries, for different stated purposes, using different equipment.

The 2026 chemical-ecology framing matters precisely because it takes the explanation out of anthropology's hands and puts it where it probably belonged all along -- in the evolutionary logic of the plant itself. Cultures didn't need to copy each other because the compound was doing consistent, recognizable work on the human brain regardless of who was burning it or why they thought they were doing so.

Expect more of this pattern to surface, not less. Archaeologists working new sites across Eurasia and beyond will likely keep turning up fresh instances of ritual cannabis use with no plausible contact between the peoples involved, and each time it happens it'll look like a fresh coincidence until someone remembers it isn't. The explanation was never really about geography. It was about a plant that kept doing the same thing to the same neurotransmitters, everywhere it grew.