“…The following eleven major smoking-related cancers were included in this analysis based on previous studies (Ha et al, 2003;Lee et al, 2006) : cancer of the lip, oral cavity, and pharynx (C00-C14); esophagus (C15), pancreas (C25), larynx (C32), and trachea, lung and bronchus cancer (C33, C34); cancer of the cervix uteri (C53), urinary bladder (C67), kidney and other urinary (C64, C65, C66, C68); stomach (C16), liver (C22) and colorectal (C18-C21) cancer. Also, this analysis limited its scope to those 35 years old and older, as most of the cumulative hazardous effects of smoking-related cancers are unlikely to manifest in individuals younger than middle age (Ha et al, 2003;Kang et al, 2003;Lee et al, 2006).…”