Columbia subject headings:
Passive smoking--Health aspects.
Smoking--Health aspects.
Tobacco smoke pollution.
Tobacco smoke--Health aspects.
Tobacco--Physiological effect.
Tobacco--Toxicology.
Harvard subject headings:
Passive smoking--Health aspects.
Smoking--Health aspects
Tobacco smoke pollution
Tobacco smoke--Health aspects.
Tobacco--Physiological effect
Tobacco--Toxicology
Princeton subject headings: