KYTX CBS 19 Tyler Longview News Weather SportsFemale smokers may be at higher risk for heart disease

(CBS) - Doctors know that smoking causes heart disease, but new research shows the risk is 25 percent higher for women who smoke than men.

Researchers reporting in the Journal Lancet say physiological differences between the sexes may be the reason. Doctors say women, on average, smoke fewer cigarettes per day than men, but they appear to be more susceptible to the toxins in cigarette smoke.