New research shows smoking during pregnancy may be more common than previously thought.
A study of over 1500 pregnant women found just over 20% reported smoking.
Of those, 10% were dependent on nicotine.
A large number of the women who reported smoking also had mental disorders like depression and anxiety.
They were also more likely to be unmarried and have less than a high school education.
Experts say smoking during pregnancy is a preventable cause of illness and death among women and newborns, and more needs to be done to educate women about the risks.