CHICAGO—Celebrations at Sunday’s Bank of America Chicago Marathon came to a crashing halt when one of the participants suffered from a runner’s high overdose. Thomas Peters, 36, collapsed when his muscles ceased to function just before the twentieth mile marker. He was promptly carted off to Rush Medical Center, where he was treated and is currently in stable condition. Peters, a self-proclaimed “marathon junkie,” has run in over 300 marathons during his lifetime, including 40 races in the last twelve