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themselves to higher levels ofcancer-causing chemicals and hazardous gases <br />such as carbon monoxide than if none of the nicotine was absorbed by the <br />water; however, this issue needs further study (4, 14,1.x. This puts waterpipe <br />smokers and second-hand smokers at risk for the same kinds of diseases as are <br />caused by cigazette smoking, including cancer, heart disease, respiratory <br />disease, and adverse effects during pregnancy (1~. <br />Regional and global patterns of waterpipe smoking <br />Waterpipe smoking is often social, and two or more people may share the same <br />waterpipe (3, c~. In South-West Asia and North. Africa, it is not uncommon for <br />children to smoke with their parents (1 ~. If used in a commercial <br />establishment such as a cafe or restaurant, the waterpipe is ordered (often from <br />a menu of flavours) and an employee prepares it from an in-house stock (8). <br />Globally, the highest rates of smoking occur in the African Region (primarily <br />North Africa), the Eastern Mediterranean Region and the South-East Asia <br />Region (~. Since the 1990s waterpipe smoking appears to be spreading among <br />new populations such as college students and young persons in the United <br />States, Brazil and European countries. Waterpipe smoking appears to be <br />stimulated by unfounded assumptions of relative safety compared to cigarettes, <br />as well as the social nature of the activity (I8). Commercial marketing, often <br />with implicit or explicit safety-related claims, may also be contributing to the <br />spread of waterpipe smoking across the globe. Waterpipe smokers may use <br />waterpipes exclusively; however, many smokers may also smoke cigarettes. In <br />some countries in which cigazette smoking is concentrated among men, <br />waterpipe smoking appears more evenly distributed between both sexes (8, <br />19). All these findings reinforce the need to conduct more research on <br />waterpipes and the issues surrounding their use, and then to disseminate the <br />information on the health risks to all countries. <br />Science base and conclusions <br />Waterpipe smoking has not been studied as intensively as has cigarette <br />smoking; however, preliminary research on patterns of smoking, the chemistry <br />of the smoke that is inhaled, and health effects supports the idea that waterpipe <br />smoking is associated with many of the same risks as cigarette smoking, and <br />may, in fact, involve some unique health risks. The science base supports the <br />following conclusions: <br />75A-12 <br />