(CNN) - A new report by the Centers for Disease Control and Prevention reveals that more than 7-percent of all expectant mothers smoke despite known risks to mother and child.
The prevalence of smoking was highest at, 25-percent in West Virginia and lowest in California, where less than 2-percent of pregnant women reported smoking.
According to the CDC, any amount of smoking during pregnancy is too much.
Smoking puts a baby at risk for birth defects and can cause a baby to be born too early or to have low birth weight.
It can also raise the risk of stillbirth or sudden infant death syndrome.
The percentage of pregnant smokers varies widely by maternal age, race, education and state.
The study was done by the CDC's National Center for Health Statistics.
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