Lifetime Smoking History and Cause-Specific Mortality in a Cohort Study with 43 Years of Follow-Up.

PLoS One · 2016 · PMC4824471 · PMID 27055053

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a negative trendno p-value reported

We found no significant association between duration of smoking cessation and risk of mortality due to lung cancer; however, a negative trend was observed.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.