RT Journal Article SR Electronic T1 Habit or addiction: the critical tension in deciding who should enforce hospital smoke-free policies JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 2085 OP 2086 DO 10.1503/cmaj.111579 VO 183 IS 18 A1 Sharon Lawn YR 2011 UL http://www.cmaj.ca/content/183/18/2085.abstract