And effect number two is we have a leftward shift in the curve. And this means that carboxy hemoglobin decreases the affinity or increases the affinity of hemoglobin to oxygen. And that means oxygen will be held much more tightly by the hemoglobin, and less of it will be released and unloaded to the tissues of our body. So we conclude that although our body actually does produce a very tiny amount of carbon monoxide, and carbon monoxide does have a certain beneficial effect in our body, because our body naturally produces such a small quantity of hemoglobin, our blood contains about 0 mercury of carbon monoxide. That means our carbon monoxide or natural levels of carbon monoxide inside our blood plasma have no adverse effects on hemoglobin. However, other processes that take place outside of our body, for example, the production of car exhaust or the process of smoking these processes produce much more carbon monoxide.