“Single-dose Pharmacokinetics and Tolerability of Oral Delta-9-Tetrahydrocannabinol in Patients with Amyotrophic Lateral Sclerosis… Cannabinoids exert neuroprotective and symptomatic effects in amyotrophic lateral sclerosis (ALS)…”

http://www.ncbi.nlm.nih.gov/pubmed/22594565