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And while millions of adults have switched from cigarettes, vaping has also attracted a new generation of nicotine addicts

Photo Credit by Davincivaporizer.com - Each year, more than 17,000 children aged under five are admitted to UK hospitals because of exposure to other people's cigarette smoke

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However, there still may be some bias (toward a positive association) from including all smoking status groups in the same model, especially if there is an unaccounted-for interactive effect between EC use and smoking history (such that those with longer smoking histories have higher health risks) which could falsely appear to carry over to PWNS