Physicians agree that smokers should give up smoking pregnancy, but smoking reduction also has a positive impact on birth weight and gestational age, according to a study appearing in the March 24 Journal of the American Medical Association.

A total of 803 pregnant smokers and 474 non-smokers from the Birmingham, Ala., area were given saliva cotadine tests at baseline, mid-pregnancy and at the end of pregnancy. The women were divided into "never smokers," "quitters" and three groups of continuing smokers: "reducers," "no-changers" and "unknown."

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