I haven't heard of it. My pain clinic dr. told me he won't prescribe weed for pain. We have many drugs that work better for longer and they know most if not all side effects. I've been on opiates for over a dozen years with no signs of ever getting off them. If they lead to an early demize so much the better. Eternity in heaven is much better than this pain filled life here. Not that I'm going to do anything stupid, I don't have that right, I'm just saying, after all these years in pain it gets tiring.