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They can lessen the amount of oxygen that your baby gets

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Our findings should be reassuring, and provide further important evidence to guide decision-making on smoking cessation during pregnancy. The study, conducted by researchers at Queen Mary University of London, University of New South Wales (Australia), the University of Nottingham, St Georges University of London, University of Stirling, University of Edinburgh, and Kings College London, and St Georges University Hospitals NHS Foundation Trust, analysed data collected in the Pregnancy Trial of E-cigarettes and Patches (PREP) randomised controlled trial, funded by the National Institute for Health and Care Research (NIHR)