Major U.S. Study Finds the Optimal Time to Give Up Smoking and Reduce Mortality

According to an extensive study, smokers who give up the habit before age
35 had mortality rates comparable to those of nonsmokers over a certain
length of time.

The study indicated that people who quit smoking after age 35 still reaped
significant advantages, but they had a higher mortality rate than those who
did so before that age.

People who quit smoking between the ages of 35 and 44 had a 21% higher risk
of dying of any cause than those who had never smoked. In addition, the
all-cause death rate was 47% higher for former smokers compared to
nonsmokers who quit between the ages of 45 and 54