JRM,
Attend Al-Anon meetings? Of course, many of the issues you face are exactly the same - co-dependency and how you can and should break the cycle.
I have been told by a few people that some Al-anon members will look down on you because of their feeling - "at least my friend / spouse / sibling / child is addicted to a 'legal' substance". Just as some AA groups are more receptive / welcoming to drug addicts than others, so are the Al-Anon groups.
The same suggestions apply - shop around the various Al-Anon groups that are available to you until you find one that suits your personality and fulfills your needs - Al-Anon and Nar-Anon are both about you - not your addict.
Keep coming back,
Jim