“Epilepsy is a chronic seizure disorder that affects about 2 million Americans and 30 million people worldwide. It is characterized by recurrent sudden attacks of altered consciousness, convulsions, or other motor activity. A seizure is the synchronized excitation of large groups of brain cells.

There are anecdotal and individual case reports that marijuana controls seizures in epileptics (reviewed in a 1997 British Medical Association report), but there is no solid evidence. While there are no studies indicating that either marijuana or THC worsen seizures, there is no scientific basis to justify such studies.”

Mar. 1999 - “Marijuana and Medicine: Assessing the Science Base”