Final answer:
Carbon monoxide has about 200 times more affinity for hemoglobin than oxygen, which can lead to carbon monoxide poisoning by inhibiting oxygen transport in the body.
Step-by-step explanation:
The substance that has approximately 200 times more affinity for hemoglobin (Hgb) than oxygen is carbon monoxide (CO). Hemoglobin is a protein in red blood cells that is primarily responsible for transporting oxygen from the lungs to the rest of the body's tissues. Oxygen indeed has a high affinity for hemoglobin - this affinity allows our bodies to efficiently capture oxygen in the lungs and deliver it to where it's needed. However, carbon monoxide has an even greater affinity for hemoglobin, which can lead to a dangerous condition called carbon monoxide poisoning. When carbon monoxide is inhaled, it binds to the hemoglobin more readily than oxygen does, which can block the transportation of oxygen and result in serious tissue damage and even death, due to oxygen deprivation.