I have had success with it in the past when I was dealing with severe arthritic pain, I found that the kush strains, grand daddy purps and white widow worked well for that. As for CRPS pain, I did try white widow a few months ago. It seemed to have the opposite effect. The burning and stinging pain seemed to be increased, unless I made cookies, (by the way, oatmeal cookies do a wonderful job of masking the flavor of the marijuana), but it was costing too much to make a batch that would be effective. Because of that, I no longer use marijuana in any form.