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This study examined the degree to which smoker age is related to making quit attempts and quit success.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design<\/jats:title>\n                    <jats:p>Ten waves of the International Tobacco Control Policy Cohort survey (ITC\u20104C) collected between 2002 and 2014, with nine wave\u2010to\u2010wave transitions with predictors at the first wave predicting quit attempts and success by the next wave.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Setting<\/jats:title>\n                    <jats:p>Canada, the United States, the United Kingdom and Australia.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Participants<\/jats:title>\n                    <jats:p>Data from 15\u2009874 smokers categorized into four age groups at baseline (18\u201324, 25\u201339, 40\u201354 and 55+\u00a0years).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Measurements<\/jats:title>\n                    <jats:p>Age, quit attempts and success (defined as \u2265\u00a030\u00a0days abstinence confirmed, if possible, on a third wave for recent attempts).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Findings<\/jats:title>\n                    <jats:p>\n                      Older smokers were more likely to smoke daily (\u03c7\n                      <jats:sup>2<\/jats:sup>\n                      \u00a0=\u00a01557.86,\n                      <jats:italic>r<\/jats:italic>\n                      \u00a0=\u00a00.136,\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0&lt;\u00a00.001) than younger smokers. Daily smokers were less likely to report quit attempts (38.1 versus 58.2%) and to achieve 30\u00a0days of abstinence (22.9 versus 34.3%) than non\u2010daily smokers. Older daily smokers were less likely to make quit attempts [0.61, confidence interval (CI)\u00a0=\u00a00.54\u20130.70,\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0&lt;\u00a00.001], even after controlling for indicators of nicotine dependence, country, sex, education, income, relationship status and household composition, than younger smokers. Younger smokers (&lt;\u00a025) were more likely to succeed for at least 30\u00a0days of abstinence, but only when compared with those aged 40\u201354 (OR = 0.83, 95% CI\u00a0=\u00a00.68\u20130.99). However, when controlling for heaviness of smoking the age effect disappeared. Significant interactions with age were found between age and intention when predicting quit attempts, and age and heaviness of smoking when predicting quit success.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>An international cohort study indicates that young smokers are more likely to attempt to quit and appear to have similar levels of success in abstaining from smoking compared with older smokers when controlling for dependence. Quit success in all ages is most predicted by lower levels of nicotine dependence.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/add.15454","type":"journal-article","created":{"date-parts":[[2021,3,2]],"date-time":"2021-03-02T10:03:16Z","timestamp":1614679396000},"page":"2509-2520","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":59,"title":["Age as a predictor of quit attempts and quit success in smoking cessation: findings from the International Tobacco Control Four\u2010Country survey (2002\u201314)"],"prefix":"10.1111","volume":"116","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5271-5206","authenticated-orcid":false,"given":"Lauren","family":"Arancini","sequence":"first","affiliation":[{"name":"IMPACT Strategic Research Centre Deakin University  Geelong VIC Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0059-178X","authenticated-orcid":false,"given":"Ron","family":"Borland","sequence":"additional","affiliation":[{"name":"Centre for Behaviour Change The University of Melbourne, School of Psychological Sciences  Parkville VIC Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Le Grande","sequence":"additional","affiliation":[{"name":"Centre for Behaviour Change The University of Melbourne, School of Psychological Sciences  Parkville VIC Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammadreza","family":"Mohebbi","sequence":"additional","affiliation":[{"name":"Biostatistics Unit, Faculty of Health Deakin University  Burwood VIC Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seetal","family":"Dodd","sequence":"additional","affiliation":[{"name":"IMPACT Strategic Research Centre Deakin University  Geelong VIC Australia"},{"name":"University Hospital Geelong, Barwon Health  Geelong VIC Australia"},{"name":"Department of Psychiatry the University of Melbourne  Parkville VIC Australia"},{"name":"Orygen, the National Centre for Excellence in Youth Mental Health  Parkville VIC Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Olivia M.","family":"Dean","sequence":"additional","affiliation":[{"name":"IMPACT Strategic Research Centre Deakin University  Geelong VIC Australia"},{"name":"University Hospital Geelong, Barwon Health  Geelong VIC Australia"},{"name":"Florey Institute of Neuroscience and Mental Health  Parkville VIC Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Berk","sequence":"additional","affiliation":[{"name":"IMPACT Strategic Research Centre Deakin University  Geelong VIC Australia"},{"name":"University Hospital Geelong, Barwon Health  Geelong VIC Australia"},{"name":"Department of Psychiatry the University of Melbourne  Parkville VIC Australia"},{"name":"Orygen, the National Centre for Excellence in Youth Mental Health  Parkville VIC Australia"},{"name":"Florey Institute of Neuroscience and Mental Health  Parkville VIC Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6223-4000","authenticated-orcid":false,"given":"Ann","family":"McNeill","sequence":"additional","affiliation":[{"name":"King's College London  London England, UK"},{"name":"UK Centre for Tobacco and Alcohol Studies  UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Geoffrey T.","family":"Fong","sequence":"additional","affiliation":[{"name":"University of Waterloo  Waterloo Ontario Canada"},{"name":"Ontario Institute for Cancer Research  Toronto Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7103-7017","authenticated-orcid":false,"given":"K. 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