Yes, a company can own an organism. There was a time when it was not allowed for a company to have ownership of an organism but now it's possible including the selling of the said organism to bidders. The person can patent that changed organism provided that the organism has not been patented before.
he would be suffering from a life threatening condition. if lasts to long he could go into a coma. its called heat stroke. symptoms can feel like a heart attack.
Cardiovascular disease would be the most likely as the oxygen taken in is polluted and enters the blood stream. Thus as it travels to the heart and throughout your body you risk disease.