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E-cigarettes: an evidence update <br /> <br />104 <br />Gravely et al., 2014 (China) <br />Are you currently using an electronic cigarette at least weekly? (Yes vs. No) <br />1. Yes <br />2. No <br /> <br />Hughes et al., 2014 (Trading Standards NW Study) <br />“Have you ever bought or tried electronic cigarettes?” <br /> <br />Hummel et al., 2014 (Netherlands) <br />Respondents who had ever tried e-cigarettes were asked how often they currently used <br />an e-cigarette (daily, at least once a week, at least once a month, less than monthly, or <br />stopped altogether <br /> <br />Lee et al., 2014 (US) <br />E-cigarette use questions were: <br /> <br />Have you ever used e-cigarettes? <br />1. yes <br />2. no <br />Have you used e-cigarettes in the past 30 days? <br />1. yes <br />2. no <br /> <br />Moore et al., 2014 (Welsh study 10-11 year olds) <br />“Have you heard of e-cigarettes before this survey?” <br />‘Have you ever used an e-cigarette? with response options of ‘no’, ‘yes, once’ or’ yes, more <br />than once’ <br /> <br />Moore et al., 2015 (Welsh study HBSC) <br />Asked whether they had ever used an e-cigarette with response options of: <br />o I have never used or tried e-cigarettes <br />o I have used e-cigarettes on a few occasions (1-5 times); <br />o I regularly use e-cigarettes (at least once a month)’. <br /> <br />