Cory Richardsのインスタグラム(coryrichards) - 5月24日 00時57分

Preparing a betel nut chew in Sri Lanka. Ever seen those deep red smiles? This is where it comes from. “Betel nut has a long history in South and Southeast Asia and the Pacific Basin. In Guam and other Pacific islands, its use can be traced back as far as 2,000 years. A habit passed down through generations, chewing betel nut is a time-honored custom for 10–20 percent of the world’s population. Today, the World Health Organization (WHO) estimates that around 600 million people use some form of betel nut. It is one of the most popular psychoactive substances in the world, in fourth place after nicotine, alcohol, and caffeine. But while betel nut is an important cultural and social tradition in many countries, growing evidence points to serious health effects from regular use as it’s classified as a carcinogen by the WHO. Many studies have shown a convincing link between betel nut use and cancer of the mouth and esophagus. A study in the Journal of the American Dental Association reports that betel nut users are at a higher risk for oral submucous fibrosis. This incurable condition can cause stiffness in the mouth and eventually the loss of jaw movement.@kristinkremers @natgeocreative

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