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Previous Volume 360:2032-2034 May 7, 2009 Number 19 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: In their study of the association between fine-particulate air pollution and life expectancy, Pope et al. (Jan. 22 issue)¹ adjusted for changes in the prevalence of smoking in order to determine the contribution of reduced levels of air pollution to an improved life expectancy. As the authors observed previously,² the effects of smoking on mortality dwarf those of air pollution, since being a current smoker increases the risk of lung cancer by 1480%, as compared with an increase of 8% per increase of 10 µg per cubic meter in fine-particulate pollution.

A potential arithmetic problem arises. Small . . . [Full Text of this Article]

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