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Résumé :
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Background. Since 2012, the Centers for Disease Control and Prevention (CDC) has implemented Tips From Former Smokers (Tips), the first federally funded tobacco education campaign in the United States. To date, there are no evaluations of its long-term impact. Aims. To assess the impact of varied doses of the Tips campaign from 2012 through 2015 on cessation-related behaviors and intentions among U.S. smokers. Method. We used a national probability-based online survey of cigarette smokers (n = 22,189) and recent quitters (n = 776) to examine associations between doses of Tips advertising, measured by gross rating points (GRPs), and intentions to quit smoking in the next 30 days and quit attempts within the past 3 months. A curvilinear (i.e., square root) functional form of GRPs was used to capture patterns of diminishing effects at higher GRP levels. Results. An increase of 1,000 quarterly Tips GRPs at the media market level was associated with increased odds of making a quit attempt in the past 3 months (adjusted odds ratio = 1.23, p
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