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[7] According to the National Youth Tobacco Survey [NYTS], current (past 30-day) use of e-cigarettes among youth doubled between 2011 and 2012, [8] and tripled among youth from 2013 to 2014

In the second stage, we regress the outcome variable (the cigarette smoking in this study) on the control variable and the predicted values of the endogenous variable from the first stage (see [25] for more detailed discussion)

These companies account for a substantial share of the global volume through extensive distribution networks and a diverse brand portfolio

A 20 pack years of smoking history means smoking one pack of cigarettes per day for 20 years, smoking two packs for 10 years, or any other pack-year combination that multiplied gives twenty