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Table 2 Classification of 20,836 US adult frequent e-cigarette users into six Tobacco Use Pathway Groups (TUPs)

From: Changing patterns of first e-cigarette flavor used and current flavors used by 20,836 adult frequent e-cigarette users in the USA

Num. TUP group N % of total sample % of frequent EC users
1 Switchers 15,807 70.5 75.9
2 Dual users of cigarettes and e-cigarettes 1330 5.9 6.4
3 Former smoker-turned-dual users 129 0.6 0.6
4 Former-smoker e-cigarette users 2483 11.1 11.9
5 Never-smoker-turned-dual users 31 0.1 0.1
6 Never-smoker e-cigarette users 1056 4.7 5.1