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In this study, the use of electronic nicotine delivery systems in YA smokers was not associated with an increase or decrease in smoking during the one-year period from 2014 to 2015. However, with the rapid development of the e-cigarette market, the use of e-cigarettes may move in different directions in the future.The cohort study used three waves of data (2013-2014, 2014-2015 and 2015-2016) from the Tobacco and Healthy Population Assessment (PATH) study, which is an ongoing longitudinal cohort study of adults and youth. Between August 2018 and October 2019, a total of 1,096 YAs (18-24 years old) were included in the analysis.

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The cohort study used three waves of data (2013-2014, 2014-2015 and 2015-2016) from the Tobacco and Healthy Population Assessment (PATH) study, which is an ongoing longitudinal cohort study of adults and youth. Between August 2018 and October 2019, a total of 1,096 YAs (18-24 years old) were included in the analysis.

The use of electronic nicotine delivery systems by young smokers has nothing to do with the increase or decrease in smoking.

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In a sample of 1096 YAs, 609 (55.6%) were young women, 698 (63.7%) were white, and 276 (25.2%) were Hispanic. The average (SD) age is 21.4 (1.9) years, and 584 (53.3%) have completed at least university studies. Among them, 214 (19.5%) were marijuana users in the first 30 days, and 161 (14.75%) smoked every day in the first 30 days. In the first wave, the average smoking frequency and intensity increased with the increase in smoking frequency in the first 30 days, until the end of the second wave. In wave 3, the average change in smoking frequency was close to zero in all groups (0.4-0.7 days). From the second wave to the third wave, the average change in smoking intensity changed more, from 5.0 cigarettes (at the end of the initial period) to 22.6 cigarettes or more (at the end of the first 30 days of use for 6 days).

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