A new study suggests women smokers face greater heart dangers than previously thought, even when they appear to be healthy.
But the threat can be reversed within five years if women quit the habit, say Canadian researchers.
But, they also warn, women who don't give up the habit and smoke as little as one a day are at higher risk of dying suddenly from heart attack and other heart problems.
The risk is doubled compared with women who don't smoke and higher for long-term smokers.
If you are thinking of quitting, and need a nudge, researchers say this latest evidence in the journal Circulation is quite compelling.
