Environmental smoking and smoking onset in adolescence: the role of dopamine-related genes. Findings from two longitudinal studies.

PLoS One · 2014 · PMC3897729 · PMID 24466121

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a significant trendno p-value reported

In step 2, we found a significant trend of friends' and sibling smoking on adolescent smoking.

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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.