Chronic exposure to fine particles and mortality: an extended follow-up of the Harvard Six Cities study from 1974 to 2009.

Environ Health Perspect · 2012 · PMC3404667 · PMID 22456598

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However, estimated effects of PM 2.5 on all-cause and cardiovascular mortality were also statistically significant (or borderline significant) in never smokers, and higher in current smokers compared to never or former smokers ( Table 2 ).

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