Table 1. Standardized Tobacco-Related Medical Subject Headings Terms and Associated “Hits” in PubMed: September 13, 2011.

Used by Institute of Medicine	Medical Subject Headings Hierarchy of Key Tobacco Terms	Articles Retrieved, No.
No	Psychiatry and psychology category → behavior and behavior mechanisms → behavior → habits → smoking	168 570
No	Psychiatry and psychology category → behavior and behavior mechanisms → behavior → tobacco use cessation → smoking cessation	22 571
No	Health care category → environment and public health → public health → environmental pollution → air pollution → tobacco smoke pollution	8930
	Chemicals and drugs category → complex mixtures → particulate matter → smoke → tobacco smoke pollution
Yes	Diseases category → substance-related disorders → tobacco use disorder	7031
	Psychiatry and psychology category → mental disorders → substance-related disorders → tobacco use disorder

Note. Numbers of articles include search as keyword in addition to Medical Subject Headings terms.