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E-cigarettes: an evidence update <br /> <br />49 <br />evidence is consistent with evidence from trials and other observational data that e - <br />cigarettes are likely to support successful quitting. <br /> <br />Figure 15: Support used and stop smoking service self-reported quit rates3 <br /> <br /> <br />Note: Figures in brackets represent the number of quit attempts in which each type of support was used. The number of clients <br />with recorded e-cigarette use is very small in comparison to those recorded to have used other types of support. <br /> <br /> <br />Use of e-cigarettes while smoking <br />Population studies <br />Two studies using data drawn from a longitudinal population sample of more than 1,500 <br />smokers in GB recently examined the impact of EC use on quitting, considering the <br />effects of frequency of EC used and type of EC. Brose et al., 2015 [45] found that <br />respondents who used EC daily at baseline were more likely to make a quit attempt one <br />year later, but were no more or less likely to quit than those who did not use EC. Daily <br />EC use at follow-up was found to be associated with reduced cigarette consumption <br />since baseline. No effects of non-daily EC use on quit attempts, quitting, or reduction in <br />consumption were found. Using data from the same Internet Cohort GB study, <br />Hitchman et al., 2015 [16] found differences in quitting between baseline and follow-up <br /> <br /> <br />3 Taken from Health and Social Care Information Centre. Statistics on NHS Stop Smoking Services in England - April 2014 to <br />December 2014.Publication date: April 23, 2015 Source: Ref 47. http://www.hscic.gov.uk/catalogue/PUB17302 <br />