Where morphine fails, marijuana may work. That’s the major finding of British research into the pain caused by nerve injuries. A pain known to be somewhat resistant to morphine and similar drugs that are the gold standard for treating just about any other kind of serious pain. Researchers suggest that active components of cannabis, which is better known as marijuana, may offer hope and have application for mitigating or eliminating pain experienced with RSD/CRPS. The key to treating Neuropathic pain with cannabis is high levels of THC daily. THC level increases are directly correlated with lower pain levels.