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To do this, we must more completely understand who is still smoking and who is exposed to secondhand smoke because this knowledge will allow us to develop and implement tobacco-control strategies tailored to these individuals

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"The take home message is that all smokers should stop smoking, even if they smoke only occasionally, or if they smoke very few cigarettes a day," Jean-Francois Etter, a researcher at the University of Geneva in Switzerland who wasn't involved in the study, said in an email

Journal of Hydrology 519, Part D, 34663474, (2014)