From September 2014 to May 2015, the Carolina Survey Research Laboratory (CSRL) at the University of North Carolina recruited a national US probability sample of 5,014 English-or Spanish-speaking adults (ages 18 and older). Two independent random digit dialing frames provided 98% coverage of US adult households. To ensure inclusion of smokers, CSRL stratified both frames by household income and smoking rates at the county-level, where the poorest counties with the highest smoking rates were oversampled. CSRL also oversampled cell phones numbers to ensure inclusion of young adults. Within the landline frame, if more than one eligible adult resided in the household, young adults and smokers were sampled at a higher rate than older adult nonsmokers. CSRL provided survey weights to account for the sampling design including stratification. Further details on the sampling approach and sample demographic characteristics are available elsewhere (11 (link)).
In December 2014, we recruited a convenience sample of 4,137 US adults through MTurk. To oversample smokers, the recruitment advertisement encouraged participation of current users of cigarettes, little cigar/cigarillos, hookah, or e-cigarette/vaping devices, but it also welcomed non-users. As is typical to ensure data quality in MTurk studies, we restricted participation to MTurk workers who had approval ratings of at least 90% and had previously completed at least 100 tasks.
In December 2014, we recruited a convenience sample of 4,137 US adults through MTurk. To oversample smokers, the recruitment advertisement encouraged participation of current users of cigarettes, little cigar/cigarillos, hookah, or e-cigarette/vaping devices, but it also welcomed non-users. As is typical to ensure data quality in MTurk studies, we restricted participation to MTurk workers who had approval ratings of at least 90% and had previously completed at least 100 tasks.
