From the 2005 National Health Interview Survey:
(Has/have) (you/Person) given birth to a liveborn infant in the past 5 years?
Were you smoking cigarettes when you became pregnant with your last child?
Did you smoke cigarettes at any time during your pregnancy with your last child?
Did you quit smoking for 7 days or longer during your pregnancy with your last child?
In what month of your pregnancy did you first quit for 7 days or longer?
Did you start smoking again during that pregnancy or did you stay off cigarettes for the rest of the pregnancy?
Females classified as smoking during pregnancy and quitting are those who answered “Yes” to smoking at any time during their pregnancy with their last child, “Yes” to quitting smoking for 7 days or longer, reported that the month they quit was the first through the third, and answered “No” to starting smoking again during the pregnancy.