For a typical person who leads a sedentary lifestyle, a typical maximum oxygen intake level would be
a. 20 ml/kg/min
b. 35 ml/kg/min
c. 50 ml/kg/min
d. 70 ml/kg/min

Answer – B (35 ml/kg/min)
  For a typical person who leads a sedentary lifestyle, the usual maximum oxygen intake level (VO2max) would be 35 ml/kg/min. VO2max is the maximum rate of oxygen uptake measured during incremental exercise. It is directly linked to the heart’s optimum capacity to transport blood to the muscles, so it is widely accepted as the standard measure of cardiorespiratory fitness.

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases. 

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