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To address potential endogeneity in cannabis use, we employ an instrumental variable (IV) approach using individual-level data. Three sets of IVs\u2014state-level cannabis laws, cannabis prices, and average cannabis use within matched gender-age groups\u2014are used to estimate two-stage least-squares models. While the results vary across health measures and IVs, the findings based on the strongest IV\u2014group average cannabis use\u2014suggest that more days of cannabis use are associated with fewer days in good mental health among users aged 21 to 64, particularly males. For adults aged 65 and older, the effects are mixed.<\/jats:p>","DOI":"10.1177\/10775587261475527","type":"journal-article","created":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T00:25:40Z","timestamp":1787790340000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Cannabis Use and Individual Health Measures"],"prefix":"10.1177","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2162-0941","authenticated-orcid":false,"given":"Weiwei","family":"Chen","sequence":"first","affiliation":[{"name":"Kennesaw State University, GA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2812-916X","authenticated-orcid":false,"given":"Michael T.","family":"French","sequence":"additional","affiliation":[{"name":"University of Miami, Coral Gables, FL, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,8,26]]},"reference":[{"key":"e_1_3_4_2_1","doi-asserted-by":"crossref","unstructured":"Alvarez L. 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