Thirdhand smoke disclosure in real estate: California adopts novel tobacco control and prevention legislation

The recognition of tobacco smoke as an environmental hazard has historically focused on secondhand smoke.1 2 However, a growing body of evidence highlights the hazards of thirdhand smoke (THS), the chemical residues that remain embedded in walls, carpets and furniture long after smoking or vaping has stopped. These residues include nicotine, carcinogenic nitrosamines and heavy metals, which can persist for years and disproportionately harm children and other vulnerable groups.3 4