Yeah, my spine is very messed up. I couldn't even walk for two years before I started using (it would be rough even to get up to use the washroom, I couldn't even cook for myself), and got caught right up in it because it made the pain evaporate and I felt pretty much like my old self, with some physical restrictions. Eventually, it just doesn't really work for pain anymore. Fuck, I have no idea how I'm going to deal with this without them.
And the doctors have the best shit. They also don't typically care about investigating pain - they would rather quickly prescribe drugs for it. A constant, cheap or free supply makes it really easy to get addicted.