A significant number of smokers believe that shisha is less harmful than other forms of smoking. Approximately 97.4% believed that smoking shisha causes serious illness such as stroke, heart attack, and lung cancer.[5] A national survey conducted by the Egyptian Smoking Prevention Research Institute showed that waterpipe smoking was inversely related to educational level, and that most users believed that using a waterpipe is less harmful than cigarettes. The survey also showed that more than 70% of male waterpipe smokers smoked in their homes in the presence of their children and wives, calling attention to the unfortunate lack of knowledge regarding indoor environmental tobacco smoke exposure.[6]