Yet another reason for women who smoke to consider quitting.

Canadian researchers say women who smoke half a pack of cigarettes a day — or even less — have a significantly higher risk of sudden cardiac death than those who never smoked.

The lead author of the research at the Mazankowski Heart Institute in Edmonton says until now, scientists didn’t know how the quantity and duration of smoking affected the risk.

To determine that relationship, researchers looked at the incidence of sudden cardiac death among more than 100-thousand women in the U-S Nurses’ Health Study.

During the study, 351 of the women died of sudden cardiac death, and of those, 223 were either current or past smokers.