Humans love altering their state of mind, and we have done so for a very long time. If you thought our ancestors waited until the dawn of agriculture or the invention of pottery to start experimenting with mind-altering substances, think again. Recent research published in Science Advances blows past earlier timelines, proving that systematic drug use goes back at least 25,000 years.
Archaeologists examining prehistoric human remains on the Indonesian island of Sulawesi discovered something deeply bizarre in the dental records of ancient hunter-gatherers. These weren't just cavities or normal wear and tear from eating gritty foraged food. These were deep, rounded grooves worn straight into the dental enamel—so severe that they occasionally exposed the inner pulp chamber.
Professor Adam Brumm of Griffith University described the bizarre wear pattern best when he noted it looked like someone had used a drill head shaped like a gobstopper to hollow out the inner part of the tooth.
So, what were these Ice Age foragers doing? They were sucking on betel nuts. Day after day, hour after hour, keeping a hard, abrasive seed rolling around their mouths.
The Real Story Behind Prehistoric Tooth Wear
For a long time, the oldest undisputed traditions of psychoactive consumption were pegged around 13,000 years ago, tied to early fermented brews like primitive beers. This new discovery shatters that baseline by thousands of years.
The research focused on two distinct sets of human remains found in limestone caves on Sulawesi. The older specimen, dating back anywhere from 16,000 to 25,000 years, represents the only known human skeletal remains from the Pleistocene epoch on the island. A second, younger set of teeth dated to roughly 7,000 years ago showed the exact same destructive pattern.
At first, scientists were entirely stumped by the unique geometry of the dental grooves. They didn't match any known tool-working habit, hide-processing technique, or standard dietary injury.
Eventually, the shape and size pointed straight to the betel nut—the seed of the Areca catechu palm. While western societies often overlook it, betel is currently the fourth most widely consumed psychoactive substance on Earth, trailing only alcohol, caffeine, and nicotine. Roughly ten percent of the global population still chews these seeds today.
How Ice Age Users Got Their Fix
Modern users don't just suck on raw betel seeds. Today, people chop or grind the nuts and wrap them in betel vine leaves, adding slaked lime made from crushed, burnt shells. This chemical mixture creates a "quid" that releases arecoline—the primary psychoactive compound—in high concentrations, staining teeth a dark reddish-brown and producing an intense stimulant high.
The ancient foragers on Sulawesi weren't doing any of that chemistry. They didn't have slaked lime or agricultural tools. Instead, they were practicing a much simpler, raw habit.
To test whether plain seeds could actually deliver a psychoactive effect without modern preparation, researchers soaked raw betel nuts in artificial saliva. The results proved that the liquid quickly absorbed enough arecoline to trigger a physiological response. When biochemical tests were run on the ancient teeth themselves, traces of arecoline were detected right inside the dental tissues.
The active compound creates a bitter, astringent taste that numbs the mouth and delivers mild euphoria along with heightened alertness. The ancient foragers weren't eating the seeds for nutrition because the nuts have virtually no caloric or dietary value. They were doing it strictly for the physical sensation.
The Vicious Cycle of Prehistoric Toothache
Every habit has a downside, and this one came with a brutal physical tax.
Archaeologists point out a dark irony in the data. Prehistoric foragers in the region already struggled with poor dental health. Because arecoline acts as a mild localized anesthetic and painkiller, researchers suspect these individuals initially started sucking on the abrasive nuts to numb severe toothaches.
Except the remedy was also the weapon.
Sucking hard, abrasive seeds day after day ground down their enamel until the pulp chambers cracked open, inviting severe bacterial infections and agonizing long-term pain. To cope with the pain caused by the nut-sucking, they sucked on more nuts. They were trapped in a self-perpetuating feedback loop of addiction and dental destruction tens of thousands of years before the invention of civilization.
This wasn't a one-off eccentric behavior by a single isolated individual either. Finding the identical groove patterns across specimens separated by thousands of years means this knowledge was culturally transmitted across generations. Prehistoric communities understood the properties of these plants and passed down the tradition long before farming ever existed.
Next time you look at the long history of human substance use, remember that our craving for a chemical escape hatch is deeply embedded in our evolutionary wiring. Long before written history, long before cities, and long before agriculture, our ancestors were already figuring out how to get high, no matter the physical cost.
