[stordoff]

Withdrawal and dependence varies massively from person to person as you say. I had been taking Tramadol (an opioid) at the maximum allowable daily dose for close to a year, and was told to stop by a new consultant. He told me it will be "hellish" and "worse than quitting heroin"; I stopped taking it immediately (without tapering), and the only effect was the return of the original pain.