Sometimes a doctor will use the term pack year to describe how long and how much a person has smoked. A pack year is defined as the number of packs of cigarettes a person has smoked every day multiplied by the number of years he or she has smoked. Since 1 pack is 20 cigarettes, a person who has smoked 20 cigarettes a day for a year is considered to have smoked 1 pack year. Someone who has smoked 30 cigarettes a day (1½ packs) for 3 years has smoked 4.5 pack years (1½ x 3), and so on. This is just another way to figure out how high your risk of smoking-related disease might be.
- Q Can I quit smoking if I've tried and failed before?
- Q How many people in the United States smoke?
- Q Are cigarettes safer if they have low tar?
- Q How does quitting smoking affect aging?
- Q What is the social impact of smoking?
- Q Why do smokers continue to smoke when they know it is not good for them?