Can steady exposure to carbon monoxide cause respiratory problems like emphysema, copd, asthma?

Would never happen. Carbon monoxide has strong affinity to the hemoglobin and its diffusibility through membrane is high. Before any other condition like asthma, COPD can occur from it, a person is dead. There will be no study to prove that.
CO. Carbon monoxide is lethal, you cannot have a steady exposure to it. Respiratory problem results from air pollution, no matter what kind it is.