[1] Univ Sains Malaysia, Natl Poison Ctr, Minden 11800, Pulau Pinang, Malaysia
[2] Canc Council Victoria, Vic Hlth Ctr Tobacco Control, Carlton, Vic, Australia
[3] Univ Waterloo, Dept Psychol, Waterloo, ON N2L 3G1, Canada
[4] Univ Waterloo, Dept Hlth Studies & Gerontol, Waterloo, ON N2L 3G1, Canada
[5] Minist Hlth, Unit Tobacco Control & FCTC, Dis Div, Kuala Lumpur, Malaysia