In a related study published online by The Lancet October 27, researchers have concluded that women who quit smoking when they are young can add 10 years to their lives. This study from the United Kingdom was based on surveys that asked 1.3 million women about their smoking history and health. A national registry kept track of the women’s deaths for more than 12 years. The women were between 50 and 65 years old at the start of the study. Twenty percent were smokers, and 28% were ex-smokers. Two-thirds of all deaths of smokers in their 50s, 60s and 70s appeared to be caused by smoking. Most of the difference between smokers and non-smokers came from smoking-related diseases like lung cancer, chronic lung disease, heart disease and stroke.
Based on this study, we can say that female smokers lose about ten years off their lifespans. Stopping before age 40 avoids more than 90% of the smoking-associated risk for early death. Stopping before age 30 eliminates 97% of smoking-associated risk for early death.