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E-cigarettes: an evidence update <br /> <br />103 <br />Canadian Tobacco, Alcohol and Drugs Survey 2013 (CTADS) <br />Trial <br />Have you ever tried an electronic cigarette, also known as an e-cigarette? <br />1. Yes <br />2. No <br />3. Refused <br />4. Don’t know <br /> <br />Last 30 day use <br />In the past 30 days did you use an electronic cigarette, also known as an e -cigarette? <br />1. Yes <br />2. No <br />3. Refused <br />4. Don’t know <br /> <br />CDC/NYTS and Dutra and Glantz <br />During the past 30 days, on how many days did you use electronic cigarettes or e - <br />cigarettes such as Blu, 21st Century Smoke, or NJOY? <br /> <br />Gravely et al., 2014 (Republic of Korea, US, UK, Canada, Australia, and Malaysia); <br />Yong et al., 2014 (UK and Australia) <br />How often, if at all, do you currently use an electronic cigarette? (dichotomised into <br />current use and non-current by combining any use responses vs. not at all) <br />1. Daily, Less than daily but at least once a week <br />2. Less than weekly but at least once a month <br />3. Less than monthly <br />4. Not at all <br /> <br />Gravely et al., 2014 (Netherlands) <br />How often do you currently use an electronic cigarette? (dichotomised into current use <br />and non-current by combining any use responses vs. have you stopped altogether) <br />1. Daily <br />2. Less than daily, but at least once a week <br />3. Less than weekly, but at least once a month <br />4. Less than monthly versus, or <br />5. Have you stopped altogether?