RT Journal Article SR Electronic T1 Cannabis every day? JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 602 OP 602 DO 10.1503/cmaj.1150034 VO 187 IS 8 A1 Shumak, Steven L. YR 2015 UL http://www.cmaj.ca/content/187/8/602.2.abstract