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A, Age-related decline in basal and cigarette smoker ELF GSH adaptive responses in smokers (S) with comparison to nonsmokers (NS); B, Concomitant increase in eNO in old smokers. Young subjects are 18–30 years old and older subjects are 45–65 years old. Bars with different letters are statistically different from one another (P < .05) (n = 3).
