4,000-year-old teeth reveal the earliest human high — Hidden in plaque Scientists have discovered the oldest direct evidence of betel nut chewing in Southeast Asia by analyzing 4,000-year-old dental plaque from a burial in Thailand. This breakthrough method reveals invisible traces of ancient plant use, suggesting psychoactive rituals were part of daily life long before written records.
https://www.sciencedaily.com/r....eleases/2025/08/2508