Today there is no longer any question that smoking is the single most important risk factor for cancer, and that an average of about 25%-30% of all cancer morbidity and mortality is related to smoking. This pertains to many types of cancer, including tumors of the oral cavity, esophagus, larynx, lung, pancreas, urinary bladder, and uterine cervix (Boyle et al. 1995, Harvard Report on Cancer Prevention 1996).

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