{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,2]],"date-time":"2025-11-02T04:08:03Z","timestamp":1762056483582,"version":"build-2065373602"},"reference-count":52,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2022,7,1]],"date-time":"2022-07-01T00:00:00Z","timestamp":1656633600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000026","name":"National Institute on Drug Abuse Research (NIDA)","doi-asserted-by":"publisher","award":["1R03DA041899-01A1"],"award-info":[{"award-number":["1R03DA041899-01A1"]}],"id":[{"id":"10.13039\/100000026","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>Research on youth use of electronic nicotine delivery systems (ENDS) has explored the correlates of initiation and use; however, little is known about the factors that predict continued youth use of ENDS. We used an ecological momentary assessment (EMA) burst design to explore both daily variability within adolescents over a two-week observation period and variability over time two years later (2018 and 2020). The contribution of device characteristics, motivations for use, contextual factors, and community factors to daily use occasions were explored. Youth participants (n = 35) at the start of the study were past two-week nicotine vapers, 14 to 17 years old, who resided within 100 miles of Louisville, KY, and reported past two-week ENDS use. Close to a quarter of participants ceased all tobacco use two years later, suggesting that some youth, despite prior regular vaping habits, may have only been experimenting with ENDS. The regular continued use of ENDS was predicted by trying to quit using cigarettes, appealing flavors, and being in locations where cigarette use was prohibited. Except for flavors, these factors did not affect ENDS use in year one. These findings suggest that tobacco policy might target ENDS use by prohibiting all tobacco use, including ENDS, in locations where smoking is already banned.<\/jats:p>","DOI":"10.3390\/ijerph19138120","type":"journal-article","created":{"date-parts":[[2022,7,3]],"date-time":"2022-07-03T22:50:46Z","timestamp":1656888646000},"page":"8120","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Changes in the Patterns and Characteristics of Youth ENDS Use over Time"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4125-8855","authenticated-orcid":false,"given":"Stephen R.","family":"Shamblen","sequence":"first","affiliation":[{"name":"Pacific Institute for Research and Evaluation, One Riverfront Plaza, Suite 2100, 401 West Main Street, Louisville, KY 40202, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Melissa H.","family":"Abadi","sequence":"additional","affiliation":[{"name":"Pacific Institute for Research and Evaluation, One Riverfront Plaza, Suite 2100, 401 West Main Street, Louisville, KY 40202, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kirsten T.","family":"Thompson","sequence":"additional","affiliation":[{"name":"Pacific Institute for Research and Evaluation, One Riverfront Plaza, Suite 2100, 401 West Main Street, Louisville, KY 40202, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4969-7297","authenticated-orcid":false,"given":"Grisel","family":"Garc\u00eda-Ram\u00edrez","sequence":"additional","affiliation":[{"name":"Pacific Institute for Research and Evaluation, Berkeley, CA 94704, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5182-710X","authenticated-orcid":false,"given":"Bonnie O.","family":"Richard","sequence":"additional","affiliation":[{"name":"Pacific Institute for Research and Evaluation, One Riverfront Plaza, Suite 2100, 401 West Main Street, Louisville, KY 40202, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,1]]},"reference":[{"key":"ref_1","unstructured":"Centers for Disease Control and Prevention (2017). 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