According to the World Health Organization, tobacco kills up to half its users, annually killing roughly six million people each year. The WHO notes that more than five million of those deaths are the result of direct tobacco use, while more than 600,000 deaths can be attributed to non-smokers being exposed to secondhand smoke. While many in the United States may understand the threat that smoking poses to their overall health, the WHO notes that studies indicate knowledge about the specific health risks of tobacco use is not widespread. A 2009 survey of smokers in China found that less than 40 percent of smokers knew that smoking tobacco causes coronary heart disease, while only 27 percent were aware of the link between smoking and stroke. It's also important that smokers recognize that cigarettes once characterized as "light" or "low tar" are not healthier than more traditional cigarettes. While the US Food and Drug Administration has banned the use of such terms in cigarette sales within the United States, smokers traveling or living overseas should be mindful that other countries may not operate under such restrictions. In addition, the American Cancer Society notes that there is no proof that cigarettes sold as "all natural" and marketed as having no chemicals or additives are any safer than traditional cigarettes and that the best way for men, women and children to avoid the dangers of tobacco is to never smoke or to quit immediately.