Pack year

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Packages of cigarettes. (WC)

Pack year, abbreviated py, is way to quantify the amount a person has smoked.

Definition

NCI defines it as:[1]

Note:

  • A standard pack has 20 cigarettes.

Examples

Example 1

1 pack per day for 40 years: 40 py.

Example 2

2 packs per day for 10 years: 20 py.

Example 3

3 cigarettes per day for 50 years: 3/20 * 50 = 7.5 py.

Example 4

Half a pack per day for 20 years: 10 py.

See also

References