I'm not minimising anything here at all but...
I've known a long term recreational heroin user, a government employee, a published poet and volunteer worker, he was absolutely fine. Still is, although he's given it up now. Ever heard of Will Self? He's a knob, but has well known heroin useage. Pink, Lou Reed, Angelina Jolie, Russell Brand, stacks of people have used and carried on. I've tried it myself, didn't like it. Ever had surgery? You had it's NHS cousin - did your brain get rewired and you got got instantly addicted? Of course not.
Heroin is not a death sentence.
Addiction, of whatever substance, is a process which is commonly associated with a lack of something in the users life. 'Chasing the Scream' explains this very well and is VERY worth reading.
I sincerely hope that those struggling with addiction can find a way out, replacing the substance with love and happiness.
This link is also worth reading, about a famous clinic near Liverpool, where they gave away heroin, crime dropped, deaths dropped, users got bored of floating around in fluffy clouds all the time and went and got jobs.
www.druglibrary.org/schaffer/misc/60minliv.htm
Then the free heroin policy was stopped, deaths went up, crime went up, peoples lives were destroyed.