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Based on prior research on respiratory symptoms among e-cigarette users, the study measured four different respiratory symptoms 3,13,16-18,20,22 : wheezing (Have you at any time during the last 12 months had wheezing or whistling in your chest?), shortness of breath (Are you troubled by shortness of breath when hurrying on level ground or walking up a slight hill?), chronic cough (Have you had a long-standing cough during the last year?), and bronchitis symptoms (Do you bring up phlegm on most days for periods of at least three months? and Have you had such periods during at least two successive years?)

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2018), and also exposure to environmental tobacco smoke (Zhang et al