RT Journal Article SR Electronic T1 Electronic cigarettes and youth: a gateway that must be shut JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 785 OP 785 DO 10.1503/cmaj.160728 VO 188 IS 11 A1 Matthew B. Stanbrook YR 2016 UL http://www.cmaj.ca/content/188/11/785.abstract