The one thing that kind of annoys me with junkies (moreso on this site than in real life) is that they tend to "universalize" the experience of their own drug addiction. The idea that someone could even have anything close to a "casual relationship" with H is unfathomable, despite the fact that users who chip seem to outnumber physically dependent addicts. So people are either 1) a heroin addict, or 2) about to become a heroin addict.
Heroin is a destructive and addictive drug and in general it's a good idea not to use it, but that attitude really irritates me sometimes. It's understandable in that H has fucked over people and therefore they want to warn people so they won't suffer the same fate, but merely issuing dire proclamations about drug use just isn't particularly helpful imo