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Résumé :
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Background. Health warning labels (HWLs) on cigarette packs in Australia, Canada, Mexico, and the United States include varying information about toxic cigarette smoke constituents and smoking-related health risks. HWL information changed more recently in Australia, Canada, and Mexico than in the United States. Aims. To investigate whether smokers’ knowledge of toxic constituents and perceived smoking-related risks increased after adding this information to HWLs and how knowledge of toxic constituents is associated with perceptions of smoking-related risks. Methods. Data come from a longitudinal, online cohort of 4,621 adult smokers surveyed every 4 months from September 2012 (Wave 1) to January 2014 (Wave 5) in Australia, Canada, and Mexico, with the United States being surveyed from Waves 2 to 5. Generalized estimating equation models estimated the association between perceived smoking-related risk at follow-up and prior wave knowledge of toxic constituents, adjusting for attention to HWLs, sociodemographics, and smoking-related characteristics. Results. Between 2012 and 2014, knowledge of toxic constituents increased in Australia, Canada, and Mexico (p
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