They impair the lung's ability to absorb oxygen and get rid of carbon dioxide, forcing carbon monoxide into the smokers blood.
(They; impair; the lung's ability to absorb oxygen and get rid of carbon dioxide,) (carbon dioxide; forcing; carbon monoxide; into the smokers blood)
They carbon dioxide
impair forcing
the lung's ability to absorb oxygen and get rid of carbon dioxide,
carbon monoxide into the smokers blood