Risk level The International Agency for Research on Cancer of the World Health Organization concluded in 2004 that there was sufficient evidence that second-hand smoke caused cancer in humans.[3] Most experts conclude that moderate, occasional exposure to second-hand smoke presents a modest but measurable cancer risk to nonsmokers. The overall risk depends on the effective dose received over time. The risk level is higher if non-smokers spend many hours in an environment where cigarette smoke is widespread, such as a business where many employees or patrons are smoking throughout the day, or a residential care facility where residents smoke freely.[78] The US Surgeon General, in his 2006 report, estimated that living or working in a place where smoking is permitted increases the non-smokers risk of developing heart disease by 25–30% and lung cancer by 20–30%.
Posted on: Fri, 01 Nov 2013 13:12:08 +0000
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