RT Journal Article SR Electronic T1 Health Canada to warn young people of cannabis risks in campaign JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1297 OP E1297 DO 10.1503/cmaj.109-5506 VO 189 IS 41 A1 Roger Collier YR 2017 UL http://www.cmaj.ca/content/189/41/E1297.abstract