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Qin, Weisiyu Abraham and Seo, Dong-Chul and Jacobs, Wura and Huang, Sijia and Elam, Kit K (2026) Developmental trajectories of positive expectancies of cannabis use effects among early adolescents: longitudinal observational study using latent class growth analysis. JMIR Public Health and Surveillance, 12, e85652. doi: 10.2196/85652.