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The analyses provided measures of STM and LTM in 610 and 439 ecstasy users and revealed moderate\u2010to\u2010large effect sizes (Cohen's <jats:italic>d<\/jats:italic>) of <jats:italic>d<\/jats:italic>\u2009=\u2009\u22120.63 and <jats:italic>d<\/jats:italic>\u2009=\u2009\u22120.87, respectively. The difference between STM versus LTM was non\u2010significant. The effect size for verbal memory was large (<jats:italic>d<\/jats:italic>\u2009=\u2009\u22121.00) and significantly larger than the small effect size for visual memory (<jats:italic>d<\/jats:italic>\u2009=\u2009\u22120.27). Indeed, our analyses indicate that visual memory may be affected more by concurrent cannabis use. Finally, we found that the total lifetime number of ecstasy tablets consumed did not significantly predict memory performance. 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