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E-cigarettes: an evidence update <br /> <br />18 <br />ASH Smokefree GB (adult and youth) surveys <br />Adult: ASH has conducted cross-sectional internet surveys of adults (aged 18 and <br />over) in Great Britain (GB) since 2007. These surveys cover a wide range of tobacco <br />control policies and smoking behaviour and are carried out on ~12,000 adults each <br />year. Questions on EC were included first in 2010, with new EC questions added in <br />each subsequent survey (2012, 2013, 2014, 2015). <br /> <br />Youth: ASH has conducted cross-sectional surveys of British youth (aged 11-18) <br />three times to date (2013, 2014, 2015). Younger participants are recruited, online, <br />through the adult YouGov participants with older participants contacted directly. It has <br />been used to give a more contemporaneous and comprehensive snapshot of youth <br />attitudes towards smoking and their behaviours (and includes a breakdown of trial and <br />more prolonged use of EC) than UK Government national surveys have been able to. <br /> <br />Internet Cohort GB survey (King’s College London, University College London) <br />A unique longitudinal internet survey of smokers and recent ex-smokers in GB (aged 16 <br />and over) surveyed first in 2012 and then again in December 2013 and 2014. Of the <br />5,000 respondents in the initial sample, 1,031 respondents (20.7%) used EC at all at the <br />time of the survey in 2012. The prevalence of past -year smoking in this baseline sample <br />was similar to that identified through the STS (which, as stated above, recruited <br />representative samples of the population in England), over a comparable period. <br /> <br />In 2013, 2,182 of the 5,000 were followed up and in 2014, 1,519 were followed up. EC <br />use was 32.8% (n=717) in 2013 and 33.2% (n=505) in 2014. The study sample was <br />recruited from an online panel managed by Ipsos MORI who were invited by email to <br />participate in an online study and were screened for smoking status. The survey <br />included questions on smoking and quitting behaviour and stress and general health as <br />well as detailed questions on EC usage. <br /> <br />ASH GB Smokers’ survey 2014 <br />This is an online survey carried out by YouGov for ASH specifically to assess more <br />detailed attitudinal measures concerning nicotine containing products. The 2014 survey <br />involved 1,203 adult smokers and recent ex-smokers selected from the ASH Smokefree <br />adult survey to have roughly equal numbers of smokers who had (n=510) and had not <br />(n=470) tried EC and a smaller number of ex-smokers who had tried EC (n=223). <br /> <br />ITC Policy Evaluation project <br />A longitudinal cohort survey of smokers and recent ex-smokers (aged 18 and over), <br />surveyed by telephone and internet. The ITC UK survey started in 2002 and surveys