Re "I have read something related to this.": Yes, that sounds like the same territory I was suggesting. The problem with heroin addicts is that it's too late to investigate their natural production of endorphins when they're already hooked as their chemical self-regulation has already been shot. My main point was that as rates of alcoholism, drug addiction, eating disorders, suicide attempts, phobias, ADHD, anxiety and depression, sex addiction, computer addiction, porn addiction, self-harming fads, and gambling are all rising it's unlikely to come down to brain chemistry simply requiring a Prozac boost. It suggests it's today's society that is engineering isolated individuals (consumers) who are trying to escape from their sense of emptiness and estrangement via compulsive, immediate-reward behaviour. It's the young who are at the sharp end of recent changes and I don't envy them their future.
On a side note: if you knew who supplied PSH with his heroin would you tell the police? If I knew someone was selling *contaminated* drugs causing deaths in the community then I would certainly let the authorities know. But otherwise, I'd regard a mutually agreed transaction between PSH and his dealer as a private affair conducted between consenting adults. I suspect that's a minority opinion!