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www.cancer.org/cancer/cancer-causes/tobacco-and-cancer/secondhand-smoke

Why is secondhand smoke a problem? Secondhand smoke (SHS) has the same harmful chemicals that smokers inhale. There’s no safe level of exposure for secondhand smoke (SHS). Secondhand smoke causes cancer. Secondhand smoke is known to cause cancer. It has more than 7,000 chemicals, including at least 70 that can cause cancer.

medlineplus.gov/secondhandsmoke.html

Secondhand smoke is a mixture of the smoke that comes from the burning end of a cigarette, cigar, or pipe, and the smoke breathed out by the smoker. It contains more than 7,000 chemicals. Hundreds of those chemicals are toxic and about 70 can cause cancer. Health effects of secondhand smoke include. Ear infections in children

www.lung.org/stop-smoking/smoking-facts/health-effects-of-secondhand-smoke.html

Secondhand smoke is a serious health hazard causing more than 41,000 deaths per year. It can cause or make worse a wide range of damaging health effects in children and adults, including lung cancer, respiratory infections and asthma.

www.mayoclinic.org/healthy-lifestyle/adult-health/in-depth/secondhand-smoke/...

Secondhand smoke is a known risk factor for lung cancer. In addition, secondhand smoke contains benzene — which increases the risk of leukemia. Heart disease. Secondhand smoke damages blood vessels and interferes with circulation, which increases the risk of heart disease and heart attack. Lung disease.

smokefree.gov/quit-smoking/why-you-should-quit/secondhand-smoke

Secondhand smoke is the combination of smoke that comes from a cigarette and smoke breathed out by a smoker. When a non-smoker is around someone smoking, they breathe in secondhand smoke. Secondhand smoke is dangerous to anyone who breathes it in. It can stay in the air for several hours after somebody smokes.

www.webmd.com/smoking-cessation/effects-of-secondhand-smoke

While you probably know smoking is bad for you, it's important to realize it's also dangerous for those near you. Learn the effects of secondhand smoke from WebMD.

www.cancer.gov/about-cancer/causes-prevention/risk/tobacco/second-hand-smoke...

Secondhand smoke (sometimes called passive smoke, environmental tobacco smoke, or involuntary smoke) is a mixture of sidestream smoke (the smoke from the burning tip of a cigarette or other smoked tobacco product) and mainstream smoke (smoke exhaled by a smoker that is diluted by the surrounding air ...

www.medicinenet.com/secondhand_smoke/article.htm

Secondhand smoke is a mixture of the smoke from the tobacco product itself (termed sidestream smoke) and exhaled smoke from the smoker (known as mainstream smoke). When a nonsmoker inhales secondhand smoke, he or she is exposed to the same toxins and chemicals, including nicotine, as the smoker.

www.cdc.gov/tobacco/data_statistics/fact_sheets/secondhand_smoke/health_effects

Secondhand smoke increases the risk for stroke by 20−30%. 4; Secondhand smoke exposure causes more than 8,000 deaths from stroke annually. 4; Breathing secondhand smoke can have immediate adverse effects on your blood and blood vessels, increasing the risk of having a heart attack. 2,3,4

en.wikipedia.org/wiki/Passive_smoking

Passive smoking is the inhalation of smoke, called secondhand smoke (SHS), or environmental tobacco smoke (ETS), by persons other than the intended "active" smoker.It occurs when tobacco smoke enters an environment, causing its inhalation by people within that environment. Exposure to secondhand tobacco smoke causes disease, disability, and death. The health risks of secondhand smoke are...