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A paan vendor in Calcutta preparing a mixture of tobacco and betel nut on a betel leaf. Alamy

Ancient teeth reveal the Ice Age origins of the world’s 4th most common addictive drug

Adam Brumm, Griffith University; Carney D. Matheson, Griffith University; Fakhri, Badan Riset dan Inovasi Nasional (BRIN); Melandri Vlok, Charles Sturt University, and Roger Papke, University of Florida

Betel nut is the fourth most-used psychoactive drug in the world – and new evidence suggests it was being used in Indonesia as long as 25,000 years ago.

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