RT Journal Article SR Electronic T1 Tobacco control measures under industry assault JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1233 OP E1234 DO 10.1503/cmaj.109-4020 VO 183 IS 17 A1 Paul Christopher Webster YR 2011 UL http://www.cmaj.ca/content/183/17/E1233.abstract