The Psychology of Conspiracy Theories: Why Do People Believe Them? By John M. Grohol, Psy.D.
… personality traits such as openness to experience, distrust, low agreeability, and Machiavellianism are associated with conspiracy belief...people with stronger conspiracy beliefs are more likely to ...have lower levels of analytic thinking...recent research demonstrating that individual narcissism, or a grandiose idea of the self, is positively related to belief in conspiracy theories.