1. Tobacco;WHO
2. The facts - tobacco, lung cancer, and secondhand smoke;Simcoe Muskoka District Health Unit
3. Smoking and cancer;Canadian Cancer Society
4. How tobacco smoke causes disease: The biology and behavioral basis for smoking-attributable disease; A report of the Surgeon General;Centers for Disease Control and Prevention (U.S.),2010
5. Tobacco use in Canada: Patterns and trends, 2015 edition;Reid