Hippocampal Neurotoxicity of Delta 9-Tetrahydrocannabinol -- Chan et al. 18 (14): 5322 -- Journal of Neuroscience I was always one to think that marijuana did not cause brain damage. I'm rather stoned right now and am not in the mood for reading, but after skipping through this it seems to say that THC is nuerotoxic. Can anybody clarify what's going on here? It seems that these guys really know what they're talking about if you ask me.