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Amotivational syndrome is a psychological condition associated with diminished inspiration to participate in social situations and activities, with episodes of apathy caused by an external event, situation, substance (or lack of), relationship (or lack of), or other cause.
While some have claimed that chronic use of cannabis causes amotivational syndrome in some users, empirical studies suggest that there is no such thing as "amotivational syndrome", per se. From a World Health Organization report:
A study done by researchers Barnwell, Earleywine and Wilcox on a sample of undergraduates also suggests that cannabis use does not cause an amotivational syndrome. The e-mail survey showed no significant difference in motivation (as measured on the Apathy Evaluation Scale) between cannabis users and cannabis abstainers.