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17.2 Science Vocab.
|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.|
|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.|