[slurgfest]

40mg oxycodone is on a different level from 300mg of heroin; although the mechanism of action is pretty much the same, you are talking about radically different doses and time courses. As well as a prescribed, regularly taken drug vs. one taken ad lib for pleasure, building up a self-driven habit.

When drawing conclusions about why people have trouble getting off opiates, I'd suggest taking the same care comparing your experience to heroin addiction as you would take comparing your weird dreams to a schizophrenic's psychotic episodes.