Youth commissioner hears that AB 455 requires disclosure of thirdhand smoke contamination in home sales

Madison Rapp of the San Dieguito Alliance for Drug Free Youth told the Encinitas Youth Commission on March 4 that California Assembly Bill 455, effective Jan. 1, 2026, requires sellers of single-family homes to disclose known indoor smoking, vaping or thirdhand smoke contamination to potential buyers.

"It is the first law in the nation requiring sellers of single family homes to disclose in writing any known indoor smoking, vaping, or thirdhand smoke contamination to potential buyers," Rapp said, and described thirdhand smoke as toxic residue that lingers on carpets, walls, furniture and dust and can persist for months or years. She noted research—work led at San Diego State University's Center for Tobacco and the Environment and earlier industry-linked studies—showing persistent nicotine and carcinogenic contamination after prolonged exposure in enclosed spaces.

Rapp said the law recognizes indoor vaping as a source of thirdhand contamination and compared its status to recognized environmental hazards such as asbestos, radon and lead paint. She urged the youth commission to use its voice to educate peers and protect future occupants, particularly children she said are especially vulnerable to lingering toxins.

Rapp cited studies showing measurable contamination long after smoke exposure and referenced chemicals listed under California's Proposition 65 as carcinogens or reproductive toxins. The commission did not take formal action on the topic; Rapp's remarks were part of the meeting's oral communications.