%0 Journal Article %A Thomas Eissenberg %A Eric Soule %A Alan Shihadeh %A , %T 'Open-System’ electronic cigarettes cannot be regulated effectively %D 2021 %R 10.1136/tobaccocontrol-2019-055499 %J Tobacco Control %P 234-235 %V 30 %N 2 %U https://tobaccocontrol.bmj.com/content/tobaccocontrol/30/2/234.full.pdf