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California’s New Landmark Thirdhand Smoke Disclosure Law

JAMA 10.1001/jama.2025.21322

November 20, 2025 at 11:00 AM EST

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This Viewpoint describes California Assembly Bill 455, which requires disclosure of thirdhand smoke contamination in residential real estate transactions, and reviews the legislation’s provisions, the evidence motivating it, and its broader implications for public health and tobacco control.

Corresponding Author: Georg E. Matt, PhD, Center for Tobacco and the Environment, San Diego State University, 9245 Sky Park Ct, #225, San Diego, CA 92123 (gmatt@sdsu.edu).

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