This article outlines the major risk factors for oral cancer. Worldwide, 25% of oral cancers were due to tobacco usage, 7-19% due to alcohol drinking, 10-15% to micronutrient deficiency, and more than 50% to betel quid chewing. Carcinogenicity is does-dependent, and those who suffer from addictions or substance abuse disorders related to tobacco and alcohol may therefore be at a higher risk.
