What Does Current Research Say About Smoking During Pregnancy

What does current research say about smoking during pregnancy?

A) Nicotine is powerfully addictive, and smoking mothers risks giving birth to an addicted neonate who would experience respiratory distress, asthma, or emphysema.
B) Nicotine has been linked to mental retardation in infants whose mothers smoked during their entire pregnancies.
C) Pregnant women should quit smoking because infants whose mothers smoked during pregnancy weigh an average of one-half pound less at birth.
D) Infants whose mothers smoked during pregnancy have higher rates of heart defects and lung defects.