betel chewing in singapore street seller flavors a betel nut leaf pinang or betel nut palm areca catechu betel nut from le minh ky trading betel nut history use buzz botany betel nut smuggling from myanmar to pinang or betel nut palm areca catechu taiwan s battle with betel nut addiction genetic and epigenetic inility ban illegal imports of betel nuts fresh betel nut aka areca n or pinang betel piper betle leaves singapore