At approximately what age do a smoker's lungs have the same capacity as the lungs of a 75-year-old nonsmoker? F. 25 G. 45 H. 65 J. 75
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Cigarette smoking can impair the normal functioning of the lungs and can even cause lung cancer as well as life-threatening respiratory diseases in the long run. As seen in the figure, the lung capacity of a non-smoker and a smoker is the same when they are both 25 years old. As the smoker ages and continuously consumes cigarettes, his/her lung capacity continues to decline way worse than the lung capacity of a non-smoker.