Ancient Tooth Markings Reveal Prehistoric Drug Use Began 25,000 Years Ago in Indonesia

Prehistoric human remains excavated on the Indonesian island of Sulawesi have pushed back the known origins of human psychoactive drug consumption by tens of thousands of years. Distinctive physical markings preserved on ancient teeth reveal that preagricultural hunter-gatherers were utilizing plant-based stimulants far earlier than archaeological science had previously documented.

The substance identified through the archaeological material is the betel nut, a seed derived from the areca palm tree. In modern times, betel nut is recognized as the fourth most frequently consumed mind-altering substance on the planet, trailing only caffeine, alcohol, and nicotine in global prevalence.

Today, the custom of consuming betel nut remains exceptionally widespread, practiced by approximately one in every ten individuals worldwide. The tradition is especially prominent across broad swaths of Asia and the Pacific, where users regularly prepare and consume a mixture known as a quid.

Under contemporary preparation methods, the processed betel nut is paired with slaked lime, chemically identified as calcium hydroxide. This alkaline additive plays a crucial biochemical role, triggering a chemical reaction that dramatically accelerates the transmission of arecoline, the nut's primary psychoactive compound, into the user's bloodstream. Chewing the prepared quid induces sensations of heightened alertness accompanied by mild euphoria.

Prior to these findings, the scientific consensus held that structured traditions of human drug usage originated approximately 13,000 years ago. Archaeologists long associated the advent of substance use with the Neolithic Revolution, a transformative era when wandering hunter-gatherer bands began domesticating crops and establishing sedentary agricultural settlements.

Evidence from that later agricultural epoch includes early barley beer brewing by farmers in the territory of modern-day Israel. Furthermore, earlier archaeological evidence from Southeast Asia had established that betel nut chewing occurred roughly 4,000 years ago.

However, the newly analyzed evidence demonstrates that ice age foragers were actively sucking on whole betel nuts between 25,000 and 16,000 years ago. This discovery indicates that the widespread modern betel custom stems from an ancestral practice that represents the oldest known instance of human drug consumption.

The findings were detailed in a research paper published in the journal Science Advances, led by Adam Brumm, an archaeology professor based at Griffith University's Australian Research Centre for Human Evolution. The study charts how this ancient behavioral habit originated among nomadic populations long before the rise of settled farming communities.

Researchers determined that while sucking on whole betel nuts delivered a less potent psychoactive effect than chewing modern lime-enhanced quids, the seeds were likely utilized by ancient individuals as a primitive form of pain relief. However, this analgesic habit appears to have produced an escalating physical dependency.

According to Brumm, the evidence indicates that foraging populations were not merely consuming psychoactive plants at an unexpectedly early point in human history, but were also succumbing to chemical dependency. Over extended periods, the prolonged consumption of the substance subjected users to adverse physical repercussions, creating a destructive feedback loop of pain and drug use.

The physical proof supporting this ancient timeline was recovered from Leang Bulu Bettue, a limestone cave located within the mountainous Maros-Pangkep karst terrain of South Sulawesi. The site was initially excavated by Brumm's investigative team in 2017.

During the excavation, researchers unearthed an upper jawbone fragment that belonged to an adult hunter-gatherer who lived between 25,000 and 16,000 years ago. While only three teeth remained intact in the fossilized maxilla, two of them exhibited unusual, deeply worn, rounded grooves caused by the prolonged placement of whole betel nuts in the mouth.

Finding such ancient skeletal remains represents a rare scientific triumph, as prehistoric bone matter deteriorates rapidly in the harsh, humid conditions typical of tropical environments like Sulawesi.

The behavioral pattern was further reinforced by a separate archaeological discovery made approximately 20.5 miles, or 33 kilometers, away at another cave site named Leang Cappolombo. A different research team working at that location in 2017 excavated the remains of another adult forager whose teeth exhibited the exact same wear patterns.

Although found in the same year, Brumm's research group was able to conduct an in-depth scientific analysis of the Leang Cappolombo dental remains three years ago. Radiocarbon dating placed that second individual between 7,600 and 6,300 years ago, demonstrating that the distinctive dental wear persisted across millennia.

Together, the anatomical traces across both cave sites demonstrate an enduring, multi-millennial habit of mind-altering substance consumption in prehistoric Indonesia, establishing that the search for chemical stimulation and pain relief is rooted deep in the human past.