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It details lung cancer as the second most common cancer and the leading cause of cancer death worldwide, with peak incidence observed between 65–75 years of age. The text highlights sex-based incidence differences, noting that while overall incidence is higher in men, adenocarcinoma is more common in women. It also mentions a convergence in mortality rates between men and women. The etiology section identifies tobacco smoking as the primary cause, accounting for approximately 90% of lung cancers, with a weaker association for lung adenocarcinoma. Other contributing factors include occupational and environmental exposure to carcinogens such as radon and asbestos, passive smoking, air pollution, and a genetic predisposition due to family history. The document further categorizes lung cancer based on the WHO classification, primarily distinguishing between Non-small cell lung cancer (NSCLC) and Small cell lung cancer (SCLC). Within NSCLC, it elaborates on lung adenocarcinoma, describing its peripheral location, prevalence in women and non-smokers, association with hypertrophic osteoarthropathy, and a generally better prognosis compared to other lung cancer types. The document also includes statistical data from images on new cancer cases per year in the US for men and women, listing prostate cancer and breast cancer as the most common, respectively, and includes data on lung and bronchus cancer incidence. 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