A new study has claimed that smokers who survive till the age of 70 still lose 4 years of life if they continue with the habit. Scientists tracked the health of 7,000 older men (mean age 77 years, range 66 to 97) from 1997 to 2012.Hazard ratios (HRs) for overall mortality and various causes of death in relation to smoking habits were calculated after adjustment for age, last known employment grade and previous diagnoses of vascular disease or cancer. During the 15-year study 5,000 of the 7,000 men died. Deaths in current smokers were about 50 percent higher than in never smokers, due to chiefly vascular disease, cancer and respiratory disease. Deaths in former smokers were 15 percent higher than in never smokers, due to chiefly cancer and respiratory disease.