Well. I am an ex-heroin addict, I have posted about this fact previously on mumsnet.
I did not claim benefits while using.
I worked, for several years, while using, until I literally became too ill (having blackouts, probably a few weeks away from organ failure / hospitalisation).
Yes I had a shite awful childhood and I took drugs as a teenager to block everything out. I was anorexic at 13, clinically depressed at 16, heroin addict at 19 and very swiftly addicted to crack cocaine and methadone as well. Junkies aren't born junkies, they start off as people, OP.
I decided when I was 24 that I would rather die than carry on living like that, and it took me a year to really turn myself around.
So now I am a Proper Person. I drive a car. I own property. I am clever, and funny, I am a wife and mother. And it really truly pisses me off that I keep hearing people talk about 'junkies' and 'scumbags' as they are talking about me. Who cares if junkies die, right? A huge number of junkies were victims of sexual abuse, rape, and / or domestic violence. Yes they will beg borrow or steal to get money to stave off the sickness of wthdrawal for another day, another few hours. I feel sorry for the poor bastards as I have been there.
And in all my years in the system, I have never been whisked away to rehab, never had any access to drug counselling of any sort, in fact I have been turned away from numerous counselling services as they 'don't deal with drug issues.' Services are slim, huge waiting lists, and addicts are often made to feel like they really are scum, even if they are truly, really seeking help and trying to turn themselves around.
So don't fall for the myth that junkies get everything and you, OP, are getting the shitty end of the stick as a result. I hope that you make a good recovery, and that your experiences don't make you bitter. Try to have compassion for other people who are in bad situations, no matter how they got there.
Good luck.