emphysemaoccurs when the air sacs in your lungs are gradually

destroyed, making you progressively more short of breath

tobacco plants of the genus Nicotiana, having soft narcotic properties

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

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

coronary arteries that supply the heart tissues with blood

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

cramptemporary partial paralysis of a muscle group, severe abdominal pain