RT Journal Article SR Electronic T1 Supporting smokers’ quit attempts reduces national smoking prevalence JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 829 OP 830 DO 10.1136/thoraxjnl-2019-213265 VO 74 IS 9 A1 Tim Coleman YR 2019 UL http://thorax.bmj.com/content/74/9/829.abstract AB