RT Journal Article SR Electronic T1 E-cigarettes “modestly effective” tool to quit smoking JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E772 OP E772 DO 10.1503/cmaj.109-4622 VO 185 IS 17 A1 Neil Chanchlani YR 2013 UL http://www.cmaj.ca/content/185/17/E772.abstract AB