Sierra Castedo-Rodgers got sober in 2012, when she was a 25-year-old graduate student at the University of Texas at Austin. After that, she abandoned her plans for a Ph.D. to pursue a more fulfilling goal: leading an on-campus program to help other former alcohol and drug addicts like her. "By the time you acknowledge you have an addiction, that shit's not fun -- pardon my language, but that's not fun," said Castedo-Rodgers, who is now the director of UT Austin's Center for Students in Recovery.