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To address the potential confounding effects of the cannabis use of the ecstasy using group , a second analysis included 14 previously tested cannabis users ( Nestor , L . , Roberts , G . , Garavan , H . , Hester , R . , 2008 . Deficits in learning and memory : parahippocampal hyperactivity and frontocortical hypoactivity in cannabis users . Neuroimage 40 , 1328 - 1339 ) .
 cannabis, ecstasy, cannabis, Deficits in learning and memory, hyperactivity, cannabis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 cannabis, ecstasy, cannabis, Deficits in learning and memory, hyperactivity, cannabis