Vallerand dubs harmonious passion and an “unhealthy” type that he labels obsessive passion. Although distinguishable, they can co-occur and – interestingly – both contribute to one’s self-image. The difference is that a harmonious passion has no psychological strings attached other than its enjoyment. In contrast, an obsessive passion entails dependence on the passionate activity. Consider two passionate joggers who injure themselves. The one who has harmonious passion about running will take time off and heal. The other who has obsessive passion will keep running and make the injury worse. (Peterson, 2013:53)
Peterson, Christopher (2013) Pursuing the Good Life: 100 reflections on positive psychology. New York: Oxford University Press.