That seems a little dubious as the relief of pain has definitely been shown to be beneficial and boy howdy, do opioids reduce pain!
There's an example of one of the studies involving back pain where opioids were found to be only 10% better than placebo, you can read the transcript on the ABC site: http://www.abc.net.au/radionational/pro ... transcript
The short version is that there can be some benefit in terms of pain reduction, but the risks associated may mean the pain is preferable, and generally in the case of back pain it's better to address the cause if you can.
If you legitimately need it you shouldn't have any trouble getting a prescription. A lot of people have convinced themselves they need it when they don't, or when addressing the underlying cause would be far better for them. Addiction's a bitch, this should help in reducing the numbers accidentally dosing themselves into it, which is a good thing.