RT Journal Article SR Electronic T1 ‘Proudly Canadian’ and ‘no Big Tobacco affiliation’: STLTH e-cigarette advertising and positioning in Canada JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP tc-2023-057960 DO 10.1136/tc-2023-057960 A1 Timothy Dewhirst YR 2023 UL http://tobaccocontrol.bmj.com/content/early/2023/05/18/tc-2023-057960.abstract AB