Transgenerational exposure to environmental tobacco smoke.

Int J Environ Res Public Health · 2014 · PMC4113874 · PMID 25032741

Europe PMC DOI

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a decreasing trendno p-value reported

Over the last years, a decreasing trend in smoking habits during pregnancy has occurred, along with the implementation of laws requiring smoke free public and working places.

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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.