Effects of smoking and aging on oxidative DNA damage of human lymphocytes.

The effects of H2O2-induced oxidative DNA damage in 80 healthy individuals with relation to age (20-25 and 55-60 years old) and smoking has been investigated with the comet assay technique. Both factors have shown a significant effect upon basal DNA damage with smoking appearing to have the most impact. A differentiation of the four groups response to induced oxidative damage was also observed. A distinctly separate behavior of the younger non-smokers group, when compared with the rest of the categories, was found. This is attributed to the lower degree of initial basal damage that occurs in their lymphocytes.