Smoked cannabis reduced daily pain by 34%.
Link: Cannabis In Painful HIV-associated Sensory Neuropathy: A Randomized Placebo-controlled Trial
Year: 2007
DOI: 10.1212/01.wnl.0000253187.66183.9c
Demonstrable efficacy of cannabis for treatment of Pain (Neuropathies, AIDS-Related) according to the results found in this study.
Cannabis (smoked)