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17.2 Science Vocab.
| Term | Definition |
|---|---|
| tar | the dark, sticky substance that forms when tobacco burns. |
| carbon monoxide | a colorless, odorless gas produced when substances, including tobacco, are burned. |
| nicotine | a stimulant drug that increases the activities of the nervous system and heart. |
| addiction | physical dependence. |
| bronchitis | an irritation of the breathing passages in which the small passages become narrower than normal and may be clogged with mucus. |
| emphysema | a serious disease that destroys lung tissue and causes breathing difficulties. |