RT Journal Article SR Electronic T1 Vaporizer legalization JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 937 OP 937 DO 10.1503/cmaj.114-0062 VO 186 IS 12 A1 Ian V. Mitchell YR 2014 UL http://www.cmaj.ca/content/186/12/937.2.abstract AB