for heroin it's ... hard to describe? one thing about heroin though is it is motivating as hell, at least in terms of motivation to _obtain heroin_ and you're going to do stuff that ranges from ill advised to ... very ill advised? anyway, thing i discovered is that if you stop taking the stuff, it takes a long time to find a replacement motivation. e.g. found myself waking up, discovering i didn't have an immediate need for heroin, and then, well that's it. nothing important to do here. it was ... annoying? fucking terrible? still is, so there's that.