Health and Safety Code section 25417.2
(a)
For purposes of this section, “thirdhand smoke” means the toxic chemical residue left behind by tobacco smoke.(b)
The Department of Toxic Substances Control shall update the Homeowners’ Guide to Environmental Hazards created pursuant to Section 10084.1 of the Business and Professions Code, updated pursuant to Section 13261, 25417, and 25417.1, and as required to be updated pursuant to Section 10084.2 of the Business and Professions Code, to include a new section on thirdhand smoke, in accordance with both of the following:(1)
To offset the costs associated with updating the guide, the Department of Toxic Substances Control shall delegate the responsibility for the update to the Center for Tobacco and the Environment at San Diego State University, which shall use existing center personnel and research resources, to the extent those resources are available.(2)
The Department of Toxic Substances Control shall review the update proposed by the Center for Tobacco and the Environment at San Diego State University to ensure the update adequately educates and informs consumers on all of the following:(A)
Thirdhand smoke as a common environmental hazard that is located on, and affects, real property.(B)
The significance of thirdhand smoke as a common environmental hazard and what can be done to mitigate this hazard.(C)
Sources that can provide more information on thirdhand smoke as a common environmental hazard for the consumer.
Source:
Section 25417.2, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=25417.2. (updated Jan. 1, 2026; accessed Dec. 29, 2025).
