### Question
What does smoke constituent mean?


### Answer
**Smoke constituent** has the following meaning in *21 U.S.C. § 387*:

> any chemical or chemical compound in mainstream or sidestream tobacco smoke that either transfers from any component of the cigarette to the smoke or that is formed by the combustion or heating of tobacco, additives, or other component of the tobacco product

#### Citation:
  - *21 U.S.C. § 387*
  - Heading: **CHAPTER 9-FEDERAL FOOD, DRUG, AND COSMETIC ACT > SUBCHAPTER IX-TOBACCO PRODUCTS**

