Smoking in adolescence contributes to attention problems that persist into adulthood, a new study of identical twins suggests. "Since our results imply that smoking causally increases attention ...

Mothers who smoke during pregnancy are more likely to have children with sleep problems from birth all the way through age 12 years. Past studies have linked substance abuse during pregnancy to ...

This paper compares the effects of obesity, overweight, smoking, and problem drinking on health care use and health status based on national survey data. Obesity has roughly the same association with ...