Columbia subject headings:
Nicotine--Physiological effect.
Nicotine--Toxicology.
Smoking--Psychological aspects.
Smoking--Social aspects.
Harvard subject headings:
Nicotine--Physiological effect
Nicotine--Toxicology.
Smoking--Psychological aspects
Smoking--Social aspects.
Princeton subject headings:
Nicotine--Physiological effect.
Nicotine--Toxicology.
Smoking--Psychological aspects.
Smoking--Social aspects.