This is interesting, and confirms what I understand about heroin addiction. This is why harm reduction is such a good policy - addicts aren't sitting around waiting for something external to appear and help them quit heroin, if they want to quit they will generally go ahead and seek out the means to do so. Until then, making sure there is a supply of clean needles etc. is the best option, while making sure facilities and medication is available to help those who have decided to fix the problem.