I know people addicted to oxi. They whine, and are MISERABLE when someone can't sell the pills... and spend $10/30mg often when prescription runs out. Honestly, all though I've used a lot of drugs, I believe anything man-made isn't meant to be used as a drug. Amphetamine speed pills make me feel AMAZING, Marijuana, shrooms, and mescaline (injested from a San Pedro or Peyote cactus) are all very healthy and fine for man to use. Perhaps I would smoke raw opium too, but addiction scares me; essentially it is the same thing as oxy. After using acid a couple times too, I called it quits for all man-made drugs....
And herbal spice, man-made weed is interesting. It is MUCH more potent, believe me if you get the right brand (ultra cloud 10). After 3 huge pipe hits I was incredibly high, straight up tripping. No hallucinations, but I would laugh hard at every single word my friend said, and everything was super "dreamy". It ended up though, making everyone very sick, and the high wasn't at ease and pure like maryjane... common for all man-made drugs. So of course this alternative shouldn't be used if you can get some weed!
Try to get clean, before it gets worse anyone addicted to oxi. Keep it mother nature : ). Let's assume you ARE abusing it, because you don't have a prescription providing your needs...