In my opinion on that is it is just like having a mom or dad who will give you money no questions asked. It is possible to quit any of the hard drugs, but the only way I know is changing everything, the so called friends gotta go, I had the opportunity to be in drug court; that put alot of responsibility on me & with the prison sentence carrot dangling in front of my head it made those responsibilities turn into building blocks to grow myself into a self respecting man again, I joined AA because I had an alcohol problem as well & also didn't have to hear the drug stories which were a sure fire trigger early on, I met alot of friends, my wife & finished all my stuff knowing I had done a great thing for myself. Hope that helps answer your question, but injection sites won't help anyone get clean, the hard part is getting thru the withdrawal period, mine lasted 47 days & it took another 4 months before I could eat, sleep & think clearly. But I still am involved in my recovery after 9 years because it saved me.
Even though I don't want to ever use again.