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Passive smoking is breathing of smoke exhaled by a smoker + smoke from the end of a burning cigarette or cigar.
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Also referred to as 2nd hand smoke or environmental tobacco smoke.
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Non-smokers exposed to 2nd hand smoke have an increased risk of lung cancer.
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Non-smokers living with a smoker are 20-30% likely to develop lung cancer.
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It can cause premature death in non-smokers.
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It increases risk of coronary heart disease by 25-40%.
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2nd hand smoke contains more than 7000 chemicals, with 69 cancer causing chemicals.
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Safe level of exposure to 2nd hand smoke is not known.