You probably think humanity picked up a taste for mind-altering substances around the time we figured out agriculture. History books love to tie things like alcohol and fermented grains to the dawn of farming roughly 13,000 years ago. It sounds neat. It fits a predictable narrative about settled life and spare grain.
It is also completely wrong. Discover more on a related topic: this related article.
New research reveals that humans were getting high up to 25,000 years ago. That pushes the timeline of habitual drug use back by more than ten millennia. Forget farming. Ice Age hunter-gatherers were already experimenting with chemistry long before they ever planted a seed.
The Clues Left in Ancient Teeth
An international team led by archaeologists at Griffith University in Australia was examining rare prehistoric human remains from limestone caves on the Indonesian island of Sulawesi. One set of remains, a jawbone fragment from a cave called Leang Bulu Bettue, dated back between 16,000 and 25,000 years. A second, younger set of remains dated back roughly 7,000 years. Further journalism by Smithsonian Magazine explores comparable perspectives on this issue.
When the researchers looked closely at the teeth, they found something baffling. Both individuals had deep, uniquely rounded grooves worn straight into their dental enamel. Some of these channels were so severe they had worn the teeth right down to the inner pulp.
Lead author Professor Adam Brumm remembers wondering what on earth could cause such bizarre wear patterns. It looked as though someone had used a miniature drill bit inside the mouth day after day, hour after hour.
The culprit wasn't a tool. It was a seed.
Sucking on Prehistoric Gobstoppers
The team identified the source as betel nuts, the hard seeds of the Areca catechu palm. Today, roughly 600 million people across Asia and the Pacific chew these nuts. Modern users typically grind or chop the seeds and mix them with slaked lime—made from crushed, burnt shells—to create a chemical reaction that releases a powerful punch.
Our Pleistocene ancestors weren't making modern quids. They were basically sucking on whole, raw betel nuts like prehistoric hard candies.
To test whether this primitive method actually did anything, the scientists got creative. They soaked betel nuts in artificial saliva and ran laboratory tests. The results confirmed that simply sucking on an intact nut releases enough arecoline—the primary psychoactive compound—to alter brain function and induce a mild high. Chemical analysis of the ancient teeth found direct traces of arecoline locked inside the dental tissue.
It was a smoking gun.
Caught in a Vicious Dental Cycle
Why would Ice Age foragers spend hours sucking on abrasive nuts? Pain relief.
If you have ever tried a raw betel nut, you know it tastes intensely bitter and astringent. Crucially, it makes your mouth go completely numb. Prehistoric foragers suffered from terrible dental health. These individuals likely started sucking on the nuts to soothe agonizing toothaches.
Yet this created a brutal trap. The hard, abrasive seeds wore down their enamel, exposing sensitive nerves and causing even worse infections. To cope with the pain of their deteriorating teeth, they kept sucking on more nuts. They were locked in a self-perpetuating cycle of addiction and dental decay thousands of years before the dawn of civilization.
What This Means for Human History
This discovery shatters the old assumption that recreational chemistry required a sedentary lifestyle. Foragers didn't wait for agriculture to invent substance use. Managing cravings, seeking out mild euphoria, and self-medicating with local flora are fundamental parts of the human experience that predate nearly everything we associate with modern society.
Look at your morning coffee or evening drink. You aren't doing anything new. You are simply participating in a deeply wired mammalian habit that started in a dark Indonesian cave tens of thousands of years ago.
Stop treating ancient humans like simple survivors who only worried about meat and shelter. They were complex, curious, and more than willing to trade their enamel for a quick escape from reality. Next time you feel the urge for a stimulant, remember that your ancestors were chasing that exact same feeling under the shadow of the Ice Age.
