the cycle of change shows the stages that some-one must go through in order to beat an addiction. It was (surprisingly/not surprisingly?) based on giving up nicotine, which is the hardest drug to give up (some suggest harder than heroin) but can be applied to any change some-one wants to make. It is based on this cycle of change that can sometimes take 7 serious attempts to get to the 'maintenance' stage of. There are versions of this, but my knowledge of it is this:
Pre-contemplation = 'i don't have a problem with drugs, I control them, not the other way round. I enjoy it, I don't want to stop, I don't need to stop.
Contemplation = 'i would like to stop, but its not the right time, I am too stressed, I will do it tomorrow when I have got xyz over with. I would like to, but I am not sure where to start. Its just not that easy though. But I will, soon'
Decision/preparation = 'i am going to do it. I need to gather some info, I need to find out where I can get help, I am going to get support and I am going to do it. I have made an appt with gp'
Action = 'I have got a meth script. I am seeking counselling, I am making changes' - this stage can be anything from 1 week to 2 years.
Maintenance 'i have not used for x amount of time, I still think about it, I sometimes want to use, and when I do I do x, but I have not used' (some argue this can be a lifetime in maintenance, some argue this is 2 years, once you go past 2 years you are in 'lifestyle change'.
Lapse = i used yesterday, I feel really shit. I really wish I had not used, I am more resolute to never use again (continue with change). Often an important step in changing an addiction as it can re-enforce the positives
Relapse = I used, fuck it, I am not ready, Its too late now, already done, can't change it now (habit returns). If you relapse, you return to a point somewhere on the cycle, usually contempation. Some argue that once you have left pre-contemplation you will never return there, don't have the ambivalence about change, even if you chose to ignore it.
There - that is the cycle of change, can be applied to drugs, or anything else you want to change really, but it is used specifically for drug addiction. You might find it helpful to know what type of journey he is on.
I would never advocate giving up any substance without strong professional support, not least something as powerful as heroin, but if you really are doing this, and want it to work for him you might find "Changing for Good by Prochasta and Diclemente a good book. He might find it useful too.