On Wikipedia I found one sentence regarding vasolidation that I find interesting:
"Tetrahydrocannabinol (THC) - the major active chemical in marijuana. Its mild vasodilating effects redden the eyes of cannabis users."
I remember articles where I read about cases where people could walk right after smoking marijuana. Maybe because of that effect.
Another fact is that vasolidation leads to a decrease in blood pressure and I read that low BP was found helpful in MS too. My only concern is that my girlfriend with MS already has low BP which confuses me a bit