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Letters
May 22/29, 2002

Does Marijuana Use Cause Long-term Cognitive Deficits?

Author Affiliations
 

Stephen J.LurieMD, PhD, Senior EditorIndividualAuthor

JAMA. 2002;287(20):2652-2654. doi:10.1001/jama.287.20.2652

To the Editor: While the study of Dr Solowij and colleagues1 demonstrates a significant difference in cognitive function between long-term users and short-term/nonusers of marijuana, I am concerned about possible selection biases. Because all the marijuana users in this trial were actively seeking assistance with reduction or cessation, the sample may be biased toward those individuals who feel they have a substance use problem so severe it requires treatment.

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