I think it's a mistake to assume that people do not assent to addiction because of its destructive effects. It takes a while for any addiction to progress to the 'destructive' stage; it's all roses at the beginning. And the beginning is when choice operates, because later there is a physiological component and volition and agency are minimised. Or even when a person is subjectively convinced that their addiction will lead to ruin, there is a wonderful sort of self deception that comes into play, and addicts are great at convincing themselves that they are somehow unique, or that they will just be able to stop. In the face of such awesome pleasure it is hard - but, I think, possible - to make genuine 'choices'.
'Ryand123' - did you get better relief for your OCD from anti-psychotics or from SSRI's? Certain SSRI's are indicated for OCD whereas others are not. I have a similar sort of OCD to what you describe and also feel like benzos and opiates are the only things that ever completely eliminatd it. But I see now that they only make things worse in the long run.