Carbon monoxide (CO) poisoning isn’t as simple a process as was once thought. Although we’ve long known of the short-term effects of CO poisoning, we haven’t really understood its long-term effects. A growing body of scientific literature clearly demonstrates that CO exposures, both acute and chronic, can result in long-term complications, including neurological diseases, cardiovascular diseases and similar problems. Further, CO exposure may play a role in firefighter deaths that have been previously ascribed to cardiovascular disease.