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Int. J. Environ. Res. Public Health 2011, 8, 2170-2180; doi:10.3390/ijerph8062170 OPEN ACCESS International Journal of Environmental Research and Public Health ISSN 1660-4601 /journal/ijerph Article Socioeconomic Differences in the Effectiveness of the Removal of the “Light”Descriptor on Cigarette Packs: Findings from the International Tobacco Control (ITC) Thailand Survey Mohammad Siahpush 1,*, Ron Borland 2, Geoffrey T. Fong 3, Tara Elton-Marshall 4, 2 5 Hua-Hie Yong and Charamporn Holumyong 1 Department of Health Promotion, Social and Behavioral Health, College of Public Health, University of Nebraska Medical Center, 986075 Nebraska Medical Center, Omaha, NE 68198, USA 2 The Cancer Council Victoria, 100 Drummond Street, Carlton, Victoria 3053, Australia; E-Mails: Ron.Borland@.au (R.B.); Hua.Yong@.au (H.-H.Y.) 3 Psychology Department, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L3G1, Canada; E-Mail: gfong@uwaterloo.ca 4 Propel Center for Population Impact, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L3G1, Canada; E-Mail: teelton@uwaterloo.ca 5 1382 Soi Panitchayakan 28, Charansanitwong 13 Rd, Thapra, Bangkokyai, Bangkok, 10600, Thailand; E-Mail: joycharam@ * Author to whom correspondence should be addressed; E-Mail: msiahpush@; Tel.: + 1-402-559-3437; Fax: + 1-402-559-