We model self-control conflict as an agent's stochastic struggle against a visceral influence that impels the agent to act sub-optimally. The agent holds costly pre-commitment technology to avoid the conflict altogether and may decide whether to procure pre-commitment or to confront the visceral influence. We examine naive expectations for the strength of the visceral influence; naive expectations lead the agent to exaggerate the expected utility of resisting temptation and so mistakenly forego pre-commitment. Contrary to accepted wisdom, our analysis reveals conditions under which higher will-power-and lower visceral influence-reduces welfare. Our analysis, therefore, calls into question policy measures that influence willpower and visceral influences. (c) 2012 Elsevier B.V. All rights reserved.