The research study into smoking habits also concluded that those smokers who kicked the habit around age 30 avoided 97% of their excess risk of premature death.
Women aged 50 to 65 were enrolled into the Million Women study, designed to investigate links between health and lifestyle, from 1996 to 2001.
Participants completed a questionnaire about living habits, medical and social factors and were re-surveyed three years later. Women were monitored for a total of 12 years on average, during which there were 66,000 deaths.
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