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Passive smoking is the inhalation of smoke, called second-hand smoke (SHS), or environmental tobacco smoke (ETS), by persons other than the intended "active" smoker. It occurs when tobacco smoke permeates any environment, causing its inhalation by people within that environment. Exposure to second-hand tobacco smoke causes disease, disability, and death.〔 ("There is sufficient evidence that involuntary smoking (exposure to secondhand or 'environmental' tobacco smoke) causes lung cancer in humans" )〕 The health risks of second-hand smoke are a matter of scientific consensus.〔〔 These risks have been a major motivation for smoke-free laws in workplaces and indoor public places, including restaurants, bars and night clubs as well as some open public spaces. Concerns around second-hand smoke have played a central role in the debate over the harms and regulation of tobacco products. Since the early 1970s, the tobacco industry has viewed public concern over second-hand smoke as a serious threat to its business interests. Harm to bystanders was perceived as a motivator for stricter regulation of tobacco products. Despite the industry's awareness of the harms of second-hand smoke as early as the 1980s, the tobacco industry coordinated a scientific controversy with the aim of forestalling regulation of their products.〔 == Effects == Second-hand smoke causes many of the same diseases as direct smoking, including cardiovascular diseases, lung cancer, and respiratory diseases.〔〔 These diseases include: * Cancer: * * General: overall increased risk; reviewing the evidence accumulated on a worldwide basis, the International Agency for Research on Cancer concluded in 2004 that "Involuntary smoking (exposure to secondhand or 'environmental' tobacco smoke) is carcinogenic to humans."〔 * * Lung cancer: passive smoking is a risk factor for lung cancer. In the United States passive smoke is estimated to cause more than 7,000 deaths from lung cancer a year among non-smokers.〔(【引用サイトリンク】url=http://www.cdc.gov/tobacco/data_statistics/fact_sheets/secondhand_smoke/health_effects/ )〕 * * Breast cancer: The California Environmental Protection Agency concluded in 2005 that passive smoking increases the risk of breast cancer in younger, primarily premenopausal women by 70%〔 and the US Surgeon General has concluded that the evidence is "suggestive," but still insufficient to assert such a causal relationship.〔 In contrast, the International Agency for Research on Cancer concluded in 2004 that there was "no support for a causal relation between involuntary exposure to tobacco smoke and breast cancer in never-smokers."〔 * * Pancreatic cancer: A 2012 meta-analysis found no evidence that passive smoking was associated with an increased risk of pancreatic cancer. * Circulatory system: risk of heart disease, reduced heart rate variability. * * Epidemiological studies have shown that both active and passive cigarette smoking increase the risk of atherosclerosis. * Lung problems: * * Risk of asthma. * * Risk of chronic obstructive pulmonary disease (COPD) * Cognitive impairment and dementia: Exposure to secondhand smoke may increase the risk of cognitive impairment and dementia in adults 50 and over. * During pregnancy: * * Low birth weight〔, part B, ch. 3. * * Premature birth〔, part B, ch. 3 (Note that evidence of the causal link is only described as "suggestive" by the US Surgeon General in his 2006 report.) Laws limiting smoking decrease premature births. * * Recent studies comparing women exposed to Environmental Tobacco Smoke and non-exposed women, demonstrate that women exposed while pregnant have higher risks of delivering a child with congenital abnormalities, longer lengths, smaller head circumferences, and low birth weight. * General: * * Worsening of asthma, allergies, and other conditions. * * Type 2 diabetes. * Overall increased risk of death in both adults, where it is estimated to kill 53,000 nonsmokers per year, making it the 3rd leading cause of preventable death in the U.S, and in children. The World Health Organization states that passive smoking causes about 600,000 deaths a year, and about 1% of the global burden of disease.〔(【引用サイトリンク】 title=Second-hand smoke )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Passive smoking」の詳細全文を読む スポンサード リンク
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