Does cannabis create narcissism?

Not really.... One can become quite self-absorbed if smoking pot becomes habitual, but "narcissism" as such (e.g., narcissistic peronality disorder" is a much more severe dysfunction of interpersonal relations than just being self-focused.
Narcissism. Selfish, inflated self esteem, not care for others' needs or feelings, love of self. Studies from Australia show that 0.1% of Cannabis abusers develop Narcissistic behaviors.
Narcissism. Cannabis creates a mild to moderate hallucinogenic high of slightly altered consciousness, and well being. Narcissism is a personality disorder characterized by grandiosity, egomania, objectification of others, feelings of specialness, and entitlement.