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The relationship between smoking, caffeine, and alcohol intake and the risk of symptomatic diverticular disease has not been investigated directly. We examined these associations in a prospective cohort of 47,678 US men, 40 to 75 years old. During 4 years of follow-up (1988 to 1992), we documented 382 newly diagnosed cases of symptomatic diverticular disease. After adjustments for age, physical activity,...