Exposure to second-hand smoke is common in many countries but the magnitude of the problem worldwide is poorly described. We aimed to estimate the worldwide exposure to second-hand smoke and its burden of disease in children and adult non-smokers in 2004.

Lancet. 2011 Jan 8;377(9760):139-46
Authors: Oberg M, Jaakkola MS, Woodward A, Peruga A, Prüss-Ustün A
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