1. Pharmaceutical care Pack-Years of Smoking prepared by Refaa AlAjmi

2. Pack-Years of Smoking
Calculating Smoking History is a simple process. It is calculated by multiplying the number of packs of cigarettes smoked per day by the number of years the person has smoked. pack year history = number of packs per day X number of years smoking For example, 1 pack year is equal to smoking 20 cigarettes (1 pack) per day for 1 year, or 40 cigarettes per day for half a year, and so on.

3. Pack-Years of Smoking
To calculate smoking pack-years: – Divide the number of cigarettes smoked per day by 20 (the number of cigarettes in a pack) – Then multiply by the number of years smoked (70 cigarettes/day ÷ 20 cigarettes/pack) X 10 years = 35 pack-years (35 cigarettes/day ÷ 20 cigarettes/pack) X 20 years = 35 pack-years (20 cigarettes/day ÷ 20 cigarettes/pack) X 35 years = 35 pack-years

4. Examples
Jill smoked 1 pack of cigarettes daily for 20 years. She has a 20 pack-year history of smoking.

5. Examples
Frank smoked 2 packs of cigarettes daily for 20 years. He has a 40 pack-year history of smoking.

6. Examples
Eleanor smoked 10 cigarettes (1/2 pack) per day for 20 years. She has a 10 pack-year history of smoking.