Children of smoking mothers are more likely to have more motor control problems, perception impairments, attention disabilities, and social problems than children of non-smoking mothers. Some reasons for these associations have been suggested: Women who breast feed and smoke pass nicotine byproducts to their babies, which may contribute to these problems. Women smokers tend to be less educated than women nonsmokers, which may cause increased stress at home. Smoking mothers and their children may share certain inherited psychologic factors, such as depression, which cause addictive and behavioral problems that are unrelated to smoking itself.