Katharine Hammond's research on secondhand smoke used to urge parents to quit smoking

Katharine Hammond's research is cited in Smoke Free Society's efforts to urge parents to observe National Parents' Day by quitting smoking.
According to Dr. Hammond's study, non-smokers receive the following equivalents of cigarette smoking:

In the non-smoking section of a restaurant = 1.5 cigarettes
In a pack-a-day smoker's home = three cigarettes
In a smoky bar for two hours = four cigarettes
Riding in a car one hour with a smoker = four cigarettes