网页关键词: 槟榔, 槟榔咀嚼块, 癌前病变, 口腔癌. Abstract: Betel-quid chewing is common in South Asia, South-east Asia, and the Pacific Islands, especially in our country. Betel-quid contains various ingredients, including areca-nut, tobacco, betel leaf, betel vine, inflorescence, slaked lime, and some special flavored substances.