{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T16:14:01Z","timestamp":1790007241111,"version":"4.0.1"},"reference-count":45,"publisher":"Oxford University Press (OUP)","issue":"3","license":[{"start":{"date-parts":[[2025,5,22]],"date-time":"2025-05-22T00:00:00Z","timestamp":1747872000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000054","name":"National Cancer Institute","doi-asserted-by":"publisher","award":["R21CA249757"],"award-info":[{"award-number":["R21CA249757"]}],"id":[{"id":"10.13039\/100000054","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,2,24]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>This study examined how e-cigarette purchasing locations are associated with tobacco use pattern and socio-demographics of e-cigarette users in the United States.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Based on a nationally representative sample of adult e-cigarette users, we assessed their purchasing locations (internet, vape shops, tobacconists, brick-and-mortar retailers, temporary sales, somewhere else including foreign country) and associations with individual demographics, frequencies of e-cigarette and cigarette use, e-cigarette product type of choice, state-level cigarette, and e-cigarette taxes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>In 2023, the most popular purchasing locations reported by adult e-cigarette users were: vape shops (65.5%), general purpose brick-and-mortar stores (43.4%), and internet (18.6%). Dual use of e-cigarettes and cigarettes was associated with higher odds (odds ratio\u2005=\u20055.3\u20135.5, p\u2005&amp;lt;\u2005.05) of buying from tobacconists. Older (odds ratio\u2005=\u20053.0\u20135.2, p\u2005&amp;lt;\u2005.01) and Hispanic (odds ratio\u2005=\u20052.85, p\u2005&amp;lt;\u2005.01) adults were more likely to make online purchases. Compared with exclusive disposable users, exclusive tank system users were more likely to buy online (odds ratio\u2005=\u20056.22, p\u2005&amp;lt;\u2005.001) or from vape shops (odds ratio\u2005=\u20052.61, p\u2005&amp;lt;\u2005.01), and exclusive rechargeable (pod\/cartridge) users were less likely to buy from vape shops (odds ratio\u2005=\u20050.29, p\u2005&amp;lt;\u2005.001). One additional dollar tax per 1\u00a0mg of e-liquid volume was associated with higher odds of buying from somewhere else or foreign countries (odds ratio\u2005=\u20051.88, p\u2005&amp;lt;\u2005.01).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>E-cigarette use frequency, dual use status of e-cigarettes and cigarettes, age, race\/ethnicity, and e-cigarette product type of choice are related to U.S. adults\u2019 e-cigarette purchasing locations.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/ntr\/ntaf110","type":"journal-article","created":{"date-parts":[[2025,5,16]],"date-time":"2025-05-16T08:18:24Z","timestamp":1747383504000},"page":"489-498","source":"Crossref","is-referenced-by-count":2,"title":["Where Do E-cigarette Users Buy Their E-cigarette Products? Results From a Nationally Representative Sample of Adult E-cigarette Users in the United States"],"prefix":"10.1093","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-6209-5146","authenticated-orcid":false,"given":"Sooa","family":"Ahn","sequence":"first","affiliation":[{"name":"Center for Tobacco Research, The Ohio State University Comprehensive Cancer Center , Columbus, OH ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6086-0622","authenticated-orcid":false,"given":"Shaoying","family":"Ma","sequence":"additional","affiliation":[{"name":"Center for Tobacco Research, The Ohio State University Comprehensive Cancer Center , Columbus, OH ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8838-4250","authenticated-orcid":false,"given":"Ce","family":"Shang","sequence":"additional","affiliation":[{"name":"Center for Tobacco 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