Second-hand smoke Health effects of tobacco

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posted sign avoid passive smoking in york university, toronto, ontario, canada.


second-hand smoke mixture of smoke burning end of cigarette, pipe or cigar, , smoke exhaled lungs of smokers. involuntarily inhaled, lingers in air hours after cigarettes have been extinguished, , may cause wide range of adverse health effects, including cancer, respiratory infections , asthma. non-smokers exposed second-hand smoke @ home or work thought, due wide variety of statistical studies, increase heart disease risk 25–30% , lung cancer risk 20–30%. second-hand smoke has been estimated cause 38,000 deaths per year, of 3,400 deaths lung cancer in non-smokers.


the current surgeon general’s report concludes there no established risk-free level of exposure second-hand smoke. short exposures second-hand smoke believed cause blood platelets become stickier, damage lining of blood vessels, decrease coronary flow velocity reserves, , reduce heart rate variability, potentially increasing risk of heart attack. new research indicates private research conducted cigarette company philip morris in 1980s showed second-hand smoke toxic, yet company suppressed finding during next 2 decades.








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