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Table 2 COPD patients estimate smoking habits of their parents.

From: Maternal smoking promotes chronic obstructive lung disease in the offspring as adults

Parameter Father Mother
Smoker/non-smoker (%) 75.0/25.0 15.4/84.6
Cumulative cigarette exposure
(% positive answers)
< 10 py 5.7 32.5
10-20 py 23.7 55.0
> 20 py 70.6 12.5
  1. py = pack/years (one pack year [py] = smoking 1 cigarette pack/day, everyday within 1 year).