science & archaeology•Fri, September 11, 2026•4 min read

25,000-Year-Old Dental Fossils Reveal Humanity's Oldest Drug Habit

Archaeologists have identified the oldest known evidence of psychoactive drug use in human history. Dental remains from Indonesia suggest ancient hunter-gatherers were habitually chewing betel nut up to 25,000 years ago. This discovery pushes back the timeline of human pharmacological experimentation by thousands of years.

A Deep-Rooted Human Behavior

The history of human drug use is far older than many experts previously believed. A groundbreaking study published in the journal Science Advances reveals that hunter-gatherers on the Indonesian island of Sulawesi were consuming betel nut—a potent psychoactive substance—as far back as 25,000 years ago. This discovery shifts our understanding of the Late Pleistocene, suggesting that the search for chemical stimulants and medicinal relief is a deeply embedded aspect of our species' history.

Rewriting the Pharmacological Timeline

Before this finding, the oldest documented evidence of drug use was tied to beer brewing in Israel, dating back roughly 13,000 years. By identifying traces of betel nut use in dental samples dating from 16,000 to 25,000 years ago, researchers have expanded that timeline by at least 3,000 to 12,000 years. This effectively proves that psychoactive plant use was prevalent long before the development of settled agriculture.

The evidence comes from tooth fossils in Sulawesi, Indonesia.
The habit dates back between 16,000 and 25,000 years.
Betel nut was likely used for its stimulant properties or as a painkiller.
The practice long predates the advent of organized agriculture.

Human use of psychoactive plants, in particular, was a lot more common in the ancient past than we can appreciate at the moment. I think it was probably a very deeply rooted aspect of human behavior.
— Adam Brumm, Professor of Archaeology at Griffith University

Why It Matters

This discovery forces a reconsideration of early human behavior. Rather than viewing drug use as a modern societal phenomenon, these findings suggest that humans have been interacting with potent botanical substances for millennia. Experts hypothesize that betel nut may have been utilized by our ancestors as a medicinal aid, possibly serving as a primitive painkiller or a stimulant for hunters traversing difficult terrain. This discovery marks a significant shift in evolutionary anthropology, emphasizing that the human history of pharmacological exploration is an ancient and continuous narrative.

Key Takeaways

Researchers discovered the oldest known evidence of drug use in 25,000-year-old teeth.
The findings indicate that ancient foragers in Indonesia habitually chewed betel nut.
This discovery pushes the record of pharmacological drug use back by up to 12,000 years.
Psychoactive plant consumption is now confirmed to predate the onset of agriculture.
The practice may have served medicinal purposes, such as pain management.

FAQ

What is the oldest evidence of drug use found?

The oldest evidence is the use of betel nut by ancient hunter-gatherers in Sulawesi, Indonesia, which dates back 25,000 years.

What were they using?

The evidence shows signs of betel nut, a plant known for its psychoactive and stimulant properties.

How did scientists determine this?

Researchers analyzed tooth fossils and found distinct wear patterns and residues consistent with the habitual chewing of betel nut.

Does this change our understanding of history?

Yes, it shows that humans were using psychoactive substances long before they transitioned to settled agriculture, indicating a much older history of pharmacological experimentation than previously assumed.