RT Journal Article SR Electronic T1 'Open-System’ electronic cigarettes cannot be regulated effectively JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP tobaccocontrol-2019-055499 DO 10.1136/tobaccocontrol-2019-055499 A1 Thomas Eissenberg A1 Eric Soule A1 Alan Shihadeh A1 , YR 2020 UL http://tobaccocontrol.bmj.com/content/early/2020/03/17/tobaccocontrol-2019-055499.abstract AB