Additional file 1 of A comparison of tobacco product prevalence by different frequency of use thresholds across three US surveys

Additional file 1 Supplementary Table 1. Surveys Description. Supplementary Table 2. Questions used to collect data about the number of days use in the past 30 days for each of the three national health surveys. Supplementary Table 3. List of Mutually Exclusive Categories of single, dual and poly tobacco product use. Supplementary Table 4. Population prevalence of exclusive, dual, and polytobacco users using three frequency of use thresholds for three national surveys*.