um i've never seen or heard that medical marijuana can provide protection from demyelination, not something i have ever personally considered or researched in regards to MS because in OZ we don't have medical marijuana. I really only know that OZ only last year started looking into doing medicinal cannabis trials for paediatric epilepsy, not dried for smoking but in liquid form because whilst it's being researched as an epilepsy cure persay there is a lot of anecdotal testimonials, beliefs etc that it helps reduce the amount of seizures.
Do you have any links to the scientific research that was run specifically for MS?
I don't see exactly how smoking medical marijuana could have any impact on the myeline (sp) sheath or anything really specific to demyelination process but I definitely get how it could be beneficial as a symptom relief...
btw we're had a few conversations about medical marijuana over the years, if you search the MS community you might find somethings been mentioned about this concept before.