1. emphysema occurs when the air sacs in your lungs are gradually destroyed, making you progressively more short of breath

2. tobacc o plants of the genus Nicotiana, having soft narcotic properties

3. nicotine a colorless, poisonous alkaloid derived from the tobacco plant and used as an insecticide. It is the substance in tobacco to which smokers can become addicted

4. addictiv e the condition of being abnormally dependent. A physical or psychological need for a habit- forming substance, such as a drug or alcohol

5. coronary arteries that supply the heart tissues with blood

6. tar the tar in cigarettes increases a smoker's risk of lung cancer, emphysema, and bronchial disorders

7. cramp temporary partial paralysis of a muscle group, severe abdominal pain