Addiction 2021 Jun 22. Epub 2021 Jun 22.
Health Promotion and Behavioral Sciences, The University of Texas Health Science Center at Houston School of Public Health, in Austin, 1616 Guadalupe Street, Suite 6.300, Austin, TX, 78701.
Aims: To examine the longitudinal trajectory of young Texan (USA) adults' Electronic Nicotine Delivery Systems (ENDS) use from 2014-2019, and to determine if there are changes in the trajectory among younger and older young adults post-2017, when vape pods surged in popularity in the United States.
Design: Nine-wave longitudinal study, with 6 months between each of the first eight waves and 1 year between the last two waves. Discontinuous, or piecewise, growth curve models were used to test the hypotheses that a) the overall current/past 30-day ENDS use trajectory would decline from 2014-spring 2017, but then increase from fall 2017-2019 and b) the increasing trajectory from 2017-2019 would occur only for younger participants, but not older participants. Read More