well I tell you the truth you want increased movement and no pain, they should look to LSD with reduced psychoactivity, a good friend of mine suffers from rheumatoid arthritis and he will agree that the pain relief is not like the pain relief of painkillers but rather a more mental approach, ie stress and relaxing, the long term usage though does not help this as your tolerance builds. Still I suppose if it helps you to live and not to want to end your life well then by all means go ahead as has been discussed in here and what seems to be a contineud point is that there are worse things you could do.