Movement Disorders stated in a Sep. 2004 article titled "Survey on Cannabis Use in Parkinson's Disease" by researchers from the Movement Disorders Centreat the Department of Neurology at Charles University, Prague, Czech Republic:

“An anonymous questionnaire sent to all patients attending the Prague Movement Disorder Centre revealed that 25% of 339 respondents had taken cannabis and 45.9% of these described some form of benefit…

The late onset of cannabis action is noteworthy. Because most patients reported that improvement occurred approximately two months after the first use of cannabis, it is very unlikely that it could be attributed to a placebo reaction.”

Sep. 2004