{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T17:57:03Z","timestamp":1785607023129,"version":"3.56.0"},"reference-count":92,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T00:00:00Z","timestamp":1782086400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T00:00:00Z","timestamp":1782086400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Health Economics"],"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Tobacco 21 (T21) laws effectively reduce youth tobacco use by preventing initiation. This study examines their impact on body weight among young adults aged 18\u201320. Using 2009\u20132019 Behavioral Risk Factor Surveillance System data and a two\u2010way fixed\u2010effects difference\u2010in\u2010differences (DID) design, we find limited evidence of broad weight changes in either direction across the BMI distribution. Obesity declines due to modest weight reductions concentrated near the upper BMI threshold, with no significant changes in overweight status or average BMI. Event study shows that the obesity decline emerges in the first post\u2010T21\u00a0year and attenuates afterward. Results are robust to alternative specifications, including an imputation DID approach addressing staggered adoption. Effects are driven by \u201cnever smokers\u201d, consistent with a prevention\u2010based pathway, and are more pronounced among males and non\u2010White individuals, with heterogeneity observed across education levels in the upper BMI tail. Supplemental analyses using Youth Risk Behavior Survey data show reduced adverse weight outcomes among high schoolers aged 18+. T21 laws increase exercise, improve diets, and reduce sedentary behavior, underage drinking, marijuana use, and mental distress. Overall, T21 laws avoid the typical cessation\u2010related weight gain and modestly improve weight outcomes among at\u2010risk young adults, suggesting broader public health benefits beyond tobacco prevention.<\/jats:p>","DOI":"10.1002\/hec.70120","type":"journal-article","created":{"date-parts":[[2026,6,23]],"date-time":"2026-06-23T03:25:03Z","timestamp":1782185103000},"page":"1406-1423","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Beyond Tobacco Prevention: The Effects of Tobacco 21 Laws on Young Adults' Body Weight"],"prefix":"10.1002","volume":"35","author":[{"given":"Qihua","family":"Qiu","sequence":"first","affiliation":[{"name":"James M. Hull College of Business Augusta University  Augusta Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaesang","family":"Sung","sequence":"additional","affiliation":[{"name":"Department of Economics, Finance, and Accounting W. A. 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