Columbia subject headings:
Passive smoking--Health aspects--Research--Evaluation.
Science--Moral and ethical aspects--United States.
United States. Environmental Protection Agency.
Harvard subject headings:
Passive smoking--Health aspects.
Smoking--Toxicology.
Tobbaco smoking--Toxicology.
United States. Environmental Protection Agency
Princeton subject headings:
Passive smoking--Health aspects--Research--Evaluation.
Science--Moral and ethical aspects--United States.
United States. Environmental Protection Agency