Marijuana alters the human cerebellar clock.
Neuroreport June 11, 2003 Daniel S O'Leary, Robert I Block, Beth M Turner et al.
The effects of marijuana on brain perfusion and internal timing were assessed using [15O] water PET in occasional and chronic users. Twelve volunteers who smoked marijuana recreationally about once weekly, and 12 volunteers who smoked daily for a number of years performed a self-paced counting task during PET imaging, before and after smoking marijuana and placebo cigarettes. Smoking marijuana...