RT Journal Article SR Electronic T1 Natural American Spirit cigarettes are marketed as ‘made different’: the role of brand positioning and differentiation JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 679 OP 682 DO 10.1136/tobaccocontrol-2020-056442 VO 31 IS 5 A1 Timothy Dewhirst YR 2022 UL http://tobaccocontrol.bmj.com/content/31/5/679.abstract AB