RT Journal Article SR Electronic T1 Health Canada e-cigarette response delayed JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E374 OP E374 DO 10.1503/cmaj.109-5122 VO 187 IS 12 A1 Lauren Vogel YR 2015 UL http://www.cmaj.ca/content/187/12/E374.abstract