The article "Soft Drinks Consumption Is Associated with Nonalcoholic Fatty Liver Disease Independent of Metabolic Syndrome in Chinese Population" (G. Meng, B. Zhang, et al., European Journal of Nutrition, 2017, online) presents the results of a study of soft drink and smoking habits in a sample of adults. Of 11,805 people who said they consume soft drinks weekly, 2527 said they were smokers. Of 14,985 who said they almost never consume soft drinks, 2503 were smokers. Find a 95\% confidence interval for the difference between the proportions of smokers in the two groups.