Yes it can, and has been for thousands of years.   However, this has been grossly exaggerated by the cannabis lobby in the USA, and is irrelevant to any decriminalisation of cannabis.

In Norway, a pharma version has been accepted to use for muscle spasms in Multiple sclerosis. Some doctors may also have tried it out against Parkinson muscle spasms

I successfully treated with a pharmaceutical cannabinoid a man who developed a strange neuropathy after spinal surgery. 'The Independent' - once an important British broadsheet daily newspaper - published my account of it (attached).

Also attached is a chapter in which I describe the bizarre and ludicrous history of how cannabis came to be added to the Index prohibitorum of drugs. I'd like to believe we manage these things more objectively and dispassionately these days but it ain't easy.