California Assembly Bill 455, introduced on February 6, 2025, aims to address the growing concern over thirdhand smoke— the toxic residue left behind by tobacco smoke that can linger in homes and buildings long after smoking has ceased. This bill seeks to enhance public awareness and safety by mandating disclosures related to thirdhand smoke for sellers of single-family residential properties.

The bill outlines several key provisions. It requires sellers to inform potential buyers in writing if they have knowledge of any residue from smoking or vaping tobacco products on the property. This disclosure is intended to protect future occupants from exposure to harmful chemicals associated with thirdhand smoke, which contains over ten toxic substances identified in California's Proposition 65.

In addition to the disclosure requirements, AB 455 mandates updates to the Homeowners’ Guide to Environmental Hazards. The guide will now include sections on thirdhand smoke, wildfires, climate change, and sea level rise, reflecting the state's commitment to addressing various environmental hazards. The Department of Toxic Substances Control will collaborate with the Center for Tobacco and the Environment at San Diego State University to ensure the guide is informative and educational.

The introduction of this bill has sparked discussions among lawmakers and public health advocates. Proponents argue that increasing awareness of thirdhand smoke is crucial for protecting vulnerable populations, particularly children and individuals with respiratory conditions. Critics, however, raise concerns about the potential burden on sellers and the real estate market, questioning whether the disclosure requirements may deter property sales.

The implications of AB 455 extend beyond real estate; it highlights California's ongoing efforts to combat the public health risks associated with tobacco use. By mandating transparency in property transactions, the bill aims to foster a healthier living environment for all residents.

As the legislative process unfolds, stakeholders will be closely monitoring the bill's progress and its potential impact on housing practices and public health initiatives in California. The outcome of AB 455 could set a precedent for how environmental hazards are addressed in real estate transactions, ultimately shaping the state's approach to public health and safety.