She went on to say, "It mostly eats into the midlife years that are often healthy, delaying the start of illness. Accordingly, a smoker who is 60 years old will usually have the same health profile as a non-smoker who is 70 years old.
According to the study's authors, in order to get the health benefits, smokers must give up entirely. Numerous medical disorders, including heart disease and stroke, are known to be brought on by smoking. Smoking raises these conditions' risk by about half. The researchers in the study stated, "Stopping smoking at every age is beneficial, but the sooner smokers get off this escalator of death the longer and healthier they can expect their lives to be."
The study used the latest data from the British Doctors Study which began in 1951 as one of the world’s first large studies into the effects of smoking and the Million Women Study which has tracked the health of women since 1996.