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Individuals were 60 multiunit housing residents in San Diego, California. All had indoor smoking bans throughout the research period, and 55 had been nonsmokers. Wipe examples from different areas and machine floor dirt examples had been examined for smoking, a marker of thirdhand smoke, and for Pb and Cd using liquid chromatography-triple quadrupole size spectrometry and inductively paired plasma-mass spectrometry, correspondingly. Tobacco smoke is a likely supply of Pb and Cd that accum