"Such scenarios show how hard it can be to determine where therapy ends and performance enhancement begins. This uncertainty about the boundary between healing and enhancement changes our sense of what is "normal" and what is not. If I become fatigued while my drug-taking coworkers stay alert, their "supernormal" stamina may well recalibrate the very idea of normal functioning. Their greater productivity might eventually legitimize their doping habit and make it compulsory for everyone. In this work environment, it is the drug-free worker who is in a state of deficiency."