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Table 1 PATH wave 1 definition of user group and subgroup

From: The impact of cigarette and e-cigarette use history on transition patterns: a longitudinal analysis of the population assessment of tobacco and health (PATH) study, 2013–2015

Wave 1 user group/subgroup Definition
1. Exclusive cigarette smoker Currently smokes cigarettes AND does not use e-cigarettes AND may also use tobacco products other than e-cigarettes
 1.1. Experimental cigarette smoker  Has not smoked 100 or more cigarettes in entire life
 1.2. Established cigarette smoker without a history of e-cigarette use  Has smoked 100 or more cigarettes in entire life AND (has never tried e-cigarettes OR has not used e-cigarettes fairly regularly)
 1.3. Established cigarette smoker with a history of e-cigarette use  Has smoked 100 or more cigarettes in entire life AND (currently does not use e-cigarettes AND has used e-cigarettes fairly regularly)
2. Exclusive e-cigarette user Currently uses e-cigarettes AND does not smoke cigarettes AND may also use tobacco products other than cigarettes
 2.1. Experimental e-cigarette user without a history of cigarette smoking  Has not used e-cigarettes fairly regularly AND has not smoked 100 or more cigarettes in entire life
 2.2. Experimental e-cigarette user with a history of cigarette smoking  Has not used e-cigarettes fairly regularly AND has smoked 100 or more cigarettes in entire life
 2.3. Established e-cigarette user without a history of cigarette smoking  Has used e-cigarettes fairly regularly AND has not smoked 100 or more cigarettes in entire life
 2.4. Established e-cigarette user with a history of cigarette smoking  Has used e-cigarettes fairly regularly AND has smoked 100 or more cigarettes in entire life
3. Dual user Currently smokes cigarettes AND uses e-cigarettes AND may also use tobacco products other than e-cigarettes and cigarettes
 3.1. Experimental dual user1  Has not smoked 100 or more cigarettes in entire life OR has not used e-cigarettes fairly regularly1
 3.2. Established dual user  Has smoked 100 or more cigarettes in entire life AND has used e-cigarettes fairly regularly
  1. 1Experimental dual user group include the following subgroups:
  2. (i) Dual user who has not smoked 100 or more cigarettes in entire life AND has not used e-cigarette fairly regularly.
  3. (ii) Dual user who has not smoked 100 or more cigarettes in entire life AND has used e-cigarette fairly regularly.
  4. (iii) Dual user who has smoked 100 or more cigarettes in entire life AND has not used e-cigarette fairly regularly.
  5. Majority of the respondents in the experimental dual user group were from group (iii), who were established cigarette smokers and were experimenting e-cigarette use in wave 1. We combined the three subgroups into 3.1. Experimental dual user group