Smoking increase the risk of all of the following cancer's, except:: (A) Ca Larynx, (B) Ca Nasopharynx, (C) Ca Bladder, (D) Ca Esophagus
Answer is B. Role of smoking and development of nasopharyngeal carcinoma is still not clear. Ref: Diet, Nutrition and Cancer: Proceedings of The 16th International Symposium on Mycotoxins By Takamatsu No Miya, Page 51; Carcinomas of The Head and Neck: Evaluation and Management By Charlotte Jacobs, Page 275; Cancer Prevention: The Causes and Prevention of Cancer By Graham A. Colditz, David John Hunter, Page 327