Subjects were 212 ITS and 194 DS recruited for this study via advertisement and promotion. The sample largely overlaps with that reported in several analyses of non-EMA data [15], [45], [52], [53], [54]. To be eligible, all volunteers had to be at least 21 years old, report smoking for at least 3 years, smoking at their current rate for at least 3 months, and not be planning to quit within the next month. DS had to report smoking every day, averaging 5 to 30 cigarettes per day. ITS had to report smoking 4 to 27 days per month, with no restrictions on number of cigarettes. By design, we oversampled African-American (AA) smokers, because national surveys indicate they are more likely to be ITS), and weighted the data to balance the representation of Caucasian and AA smokers.
Subjects were 212 ITS and 194 DS recruited for this study via advertisement and promotion. The sample largely overlaps with that reported in several analyses of non-EMA data [15], [45], [52], [53], [54]. To be eligible, all volunteers had to be at least 21 years old, report smoking for at least 3 years, smoking at their current rate for at least 3 months, and not be planning to quit within the next month. DS had to report smoking every day, averaging 5 to 30 cigarettes per day. ITS had to report smoking 4 to 27 days per month, with no restrictions on number of cigarettes. By design, we oversampled African-American (AA) smokers, because national surveys indicate they are more likely to be ITS), and weighted the data to balance the representation of Caucasian and AA smokers.
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