how tobacco affects the digestive system do cigarettes cause stomach problems Smoking: Effects, Risks, Diseases, Quitting & Solutions Can Vaping Cause Stomach Issues? – Risks of Tobacco - UF

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They naturally contain nicotine because they are tobacco leaf

1988 Reducing the Health Consequences of Smoking: 25 Years of Progress: A Report of the Surgeon General US Department of Health and Human Services, Public Health Service, Centers for Disease Control, Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health: Rockville, MD US Department of Health and Human Services

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No theyre not completely-risk free, and do contain nicotine which is an addictive substance, but the scientific evidence to date suggests they may be significantly less harmful compared to cigarettes