RT Journal Article SR Electronic T1 E-cigarettes and youth smoking: be alert but not alarmed JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 359 OP 360 DO 10.1136/tobaccocontrol-2017-054002 VO 27 IS 4 A1 Gartner, Coral E YR 2018 UL http://tobaccocontrol.bmj.com/content/27/4/359.abstract AB