(Portland, OR) -- Cannabis products only provide short-term reduction in chronic pain, according to a review by Oregon Health & Science University. Researchers evaluated more than three-thousand studies and found only 25 with scientifically valid evidence concerning cannabis. The short-term benefit can help with pain experienced by diabetics and similar neuropathic pain. Side effects include sedation and dizziness. Anyone considering using cannabis products for pain relief should consult with their doctor first.