RT Journal Article SR Electronic T1 Evolving chemical landscape of e-cigarettes, 2021 JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP e1 OP e2 DO 10.1136/tobaccocontrol-2021-056808 VO 31 IS e1 A1 Elise Hickman A1 Ilona Jaspers YR 2022 UL http://tobaccocontrol.bmj.com/content/31/e1/e1.abstract AB