Dr.It was a link in a chain of causation that resulted in the aggravation of a passenger's pre-existing medical condition by exposure to a normal condition (smoking, which was permitted) in the aircraft cabin.Abid Husain was traveling aboard an Olympic Airways flight from Athens to New York, returning to the United States from a vacation with his wife and family.As Dr. Husain was struggling to breathe, his wife, Rubina Husain, made three urgent requests that he be moved away from the smoke.Her requests were refused.