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[PMC free article: PMC4012803] [PubMed: 24751181] Interventions With Adequate Evidence of a Decreased Risk of Oral Cavity, Oropharyngeal, Hypopharyngeal, and Laryngeal Cancers Tobacco Cessation The cessation of cigarette smoking is associated with an approximately 50% reduction in risk of developing oral cavity, oropharyngeal, and hypopharyngeal cancers within 5 to 9 years,[1] and a return to a cancer risk comparable to that of never-smokers within 20 years.[1] For laryngeal cancer, the risk reduction is approximately 40% within 5 to 9 years, and a similar return to cancer risk comparable to that of never-smokers within 20 years.[1] References Marron M, Boffetta P, Zhang ZF, et al.: Cessation of alcohol drinking, tobacco smoking and the reversal of head and neck cancer risk