Altered Fluorescence of Buccal Cells as a Candidate Biomarker for Areca Nut Chewing.

: Betel nut is used by an estimated 600 million people globally and is the 4th most widely used psychoactive substance in the world. Its use has been shown to cause oral and esophageal cancers. Therefore, cessation programs are needed in which an effective biomarker can be employed.