I was prescribed Tramadol over 30 years ago as a last resort for pain resulting for a cervical spine strain.  It did nothing for pain and  made me feel nauseous.  Ended up in physiotherapy and my pain eventually resolved.  From experience I believe this particular pharmaceutical has low addictive properties.  I've also been prescribed codeine-based pharmaceuticals as well as oxy-pharmaceuticals for post-op and acute pain and, in addition to pain relief,  experienced a mild feeling of euphoria.  So I can understand why opioid based pharmaceuticals are  addictive and why it's important to follow the physician's instructions in terms of transitioning to anti-inflammatories, aspirin or low-dose codeine for pain management ASAP.