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E-cigarettes: an evidence update <br /> <br />102 <br />whether they currently used e-cigarettes every day, some days or not at all. If not at all, <br />they were asked if they ever used e-cigarettes “fairly regularly.” If not, whether they had <br />used only once or twice or more often than that. All who had used more than once or <br />twice, were asked a series of questions about their patterns of use: for how long they <br />had used e-cigarettes (less than a month, 1–6 months, more than 6 months); whether <br />they had ever used e-cigarettes daily for at least one week; if so for how long they had <br />used e-cigarettes daily. From these variables, a 3-level measure of intensity of e- <br />cigarette usage was computed: 3 = intensive (used daily for at least 1 month); 2 = <br />intermittent (more than once or twice but not daily for a month or m ore); 1 = non-use or <br />at most once or twice. <br /> <br />Borderud et al., 2014 (US) <br />Patients were asked if they had used E-cigarettes within the past 30 days, with the <br />response options being yes or no. <br /> <br />Brose et al, 2015 and Hitchman et al., 2015 (GB) <br />How often, if at all, do you currently use an electronic cigarette? [Asked of respondents <br />who had ever heard of e-cigarettes and had ever tried one.] <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 <br />5. Not at all <br />6. Don't know <br /> <br />What electronic cigarette equipment do you currently use the most? <br />1. A disposable electronic cigarette (non-rechargeable) <br />2. A commercial electronic cigarette kit which is refillable with pre-filled cartridges <br />3. A commercial electronic cigarette kit which is refillable with liquids <br />4. A modular system (I use my own combination of separate devices: batteries, atomizers, <br />etc.) <br />5. Don’t know <br /> <br />Brown et al., 2014 (England) <br />Which, if any, of the following did you try to help you stop smoking during the most <br />recent serious quit attempt? <br />1. E-cigarettes <br />2. NRT bought over-the-counter <br />3. No aid