TY - JOUR T1 - Health Canada to warn young people of cannabis risks in campaign JF - Canadian Medical Association Journal JO - CMAJ SP - E1297 LP - E1297 DO - 10.1503/cmaj.109-5506 VL - 189 IS - 41 AU - Roger Collier Y1 - 2017/10/16 UR - http://www.cmaj.ca/content/189/41/E1297.abstract ER -