Blood tests on people who smoke cigarettes regularly indicate that about $5\%$ of their haemoglobin is carrying carbon monoxide. People who use e-cigarettes inhale a vapour that contains no carbon monoxide. A person who usually smokes cigarettes stops and changes to e-cigarettes, then has a blood test performed after one month. Which chemical in the blood would be present at a lower concentration in this blood test?
- Acarbaminohaemoglobin
- Bcarbonic anhydrase
- Ccarboxyhaemoglobin
- Dhydrogencarbonate ions