Columbia subject headings:
Passive smoking.
Smoking--Law and legislation--United States.
Tobacco--Physiological effect.
Harvard subject headings:
Smoking--Law and legislation--United States
Smoking--United States
Tobacco--Physiological effect
Tobacco--Toxicology
Princeton subject headings:
Cigarette smoke--Toxicology.
Industrial toxicology.
Passive smoking--Toxicology.
Smoking--Government policy--United States.
Tobacco--Toxicology.