Subject headings are index terms that are found in bibliographic records that describe what the resource is about.
| anti-smoking campaigns | e-cigarettes | high school students | |
| MeSH |
Smoking Prevention Smoking Cessation |
Electronic Nicotine Delivery Systems |
Adolescent Students Minors |
| Emtree |
Smoking Prevention Smoking Cessation |
Electronic Cigarette | High School Student |
| CINAHL | Smoking Cessation Programs | Electronic Cigarettes | Students, High School |
Subject headings are terms that are found within controlled vocabularies, or subject heading lists. Some common subject heading lists used in health and medicinal databases include: