Cannabis use in people with Parkinson's disease and Multiple Sclerosis: A web-based investigation.

Objectives: Cannabis has been used for medicinal purpose for thousands of years; however the positive and negative effects of cannabis use in Parkinson's disease (PD) and Multiple Sclerosis (MS) are mostly unknown. Our aim was to assess cannabis use in PD and MS and compare results of self-reported assessments of neurological disability between current cannabis users and non-users.

Methods: An anonymous web-based survey was hosted on the Michael J.