Yes, there is such a thing as an "adrenaline junkie." I discussed your question with psychiatrist Bernard D. Beitman, M.D., Visiting Professor of Psychiatry and Neurobehavioral Sciences at the University of Virginia. Dr. Beitman notes that although the condition is recognized by the scientific community, the term is not yet an official psychiatric diagnosis and, like "sex addiction," the concept needs to be sharpened and clarified through physiological and interview studies.