If you smoke your destroy the functioning of the air sacs in the lungs when you breathe and you will still draw the same amount of oxygen but your body will not be able to use it why not?

When you smoke, harmful chemicals damage the air sacs (alveoli) in the lungs, impairing their ability to transfer oxygen into the bloodstream effectively. Although you might still inhale the same volume of air and oxygen, the compromised alveoli cannot facilitate efficient gas exchange. Consequently, your body struggles to utilize the oxygen, leading to reduced oxygen availability for vital organs and tissues, which can result in various health issues.