A large trial, involving more than 100,000 women, saw significant declines in several death risks within 5 years of putting out the last cigarette.

This is undoubtedly welcome news for many female smokers, as it shows that the dangers of smoking are reversible and can decline to the level of nonsmokers. This does not happen over night though, as for some conditions like lung cancer, it can take as long as 30 years of no smoking to equalize the risk.