I personally suggest Ullr, Eir, Loki, Dionysus, or.. Well that's about all I can think of, maybe Angrbodea.
All but Dionysus are Norse; Ullr is a hunter god, also a deity usually sworn by for oaths. Also single combat, which can be a "fight against your addiction"
Eir is the Aesir Norse goddess of healing, so that is just a given. (She may not be Aesir, but I'm fairly certain)
Loki, well Loki is a shapeshifting god for one (a fire-etin) and as those to two things are under giant; combined with whom he is you get a god that will "burn away and change you to rid yourself of addiction".
Dionysus is the Greek god of wine, as someone else said he is used for breaking out of it.
Angrbodea is the Norse Hag of Ironwood, hag is in fact a term of respect in this retrospect. She's basically a wolf goddess, if you are not tough enough for her and she won't work with you, don't push it.
Give whomever you decide on an offering. Norse gods, that is mead, an action in their name, or a specific item to them. I'll let you do some research, as you should read about which deity you choose.
Now for the sigil I suggest runes naturally, but when you go about this, again I would choose a god, an offering then wait a day or so, create your sigil and when you imbue it say something like "as I give to you, I ask for your help, please put your strength and energy into this to help me." Nice and simple, but too generic; if you could fill the blanks?
Runes: Naudhiz, necessity, it can be used as the power of a need, which you can use to break your addiction.
Eihwaz, this rebirth/death as in the death of your drug addiction and rebirth of you.
Uruz, for strength to go through this.
Put these together for a bind-rune and ta da.
Mail me if you have any questions.
I think Shadow did good by suggesting Angrboda. She's a very tough deity, but what sh teaches is worth it. She teaches inner strength, and can give you the power to pull through this tough trial in your life. Working with her can strengthen you, mentally, to help you to avoid the drugs you're addicted to.
I normally wouldn't suggest it, but Fenrir might not be a bad option for you either. Fenrir is Loki's wolf-son, and a deity in his own right. He teaches people to look at the darkest, most negative parts of themselves and come to terms with it. He teaches that just because we have those parts, we are not bad people, and that we can live a life to the full as long as we recognize that those parts are there and accept them as pieces of ourselves. You might find this helpful along the process as well.
Angrboda and Fenrir work exceptionally well together, since Angrboda is Fenrir's mother. So the two of them might make for a good combination for you.
That would be ASKLEPIOS (or Asclepius) for the Greek God of Healing and Medicine. Information on him can be found at http://www.theoi.com/Ouranios/Asklepios.html
Thanks everyone for the thoughts and ideas, I'm initialy drawn to the idea of hagith as i like angel/demon systems, i downloaded the Arbatel and am going through it.
I'm also curious about the nordic pagan systems to, i will be researching any and all names that people mention. I'd like to work with something thats abit more on the gentle side as i don't think i can take any extra harshness(even if its in my best interest) during the withdrawal phase. But i will research them and keep them in mind for afterwords when i need to start building up my strength.
Just remember that a higher power exists. It is undeniable and essential to the recovery process to admit powerlessness over your addiction and to become willing to accept that a power greater than yourself can return you to sanity if they are sought. No matter what you call that power it is all knowing, all forgiving and all loving.
What Barbi said, the key to working a program will get to that higher power.
I hope the sigil work in the Arbatel is useful. I really like you idea of creating your own sigil for this kind of work as well. What a great way to approach it! I don't know if it is relevant or you have this book already but Frater UD's "practical sigil magick" comes to mind.
As far as gentle Norse deities, the only one that comes to mind in Baldur. Though there are a lot of much more knowledgable operators than I on the subject.
If you're looking for a nice Norse deity who doesn't have some rough edges and harshness, you might be out of luck. Eir would probably be the safest one to go with. Definitely not Fenrir or Angrboda.
I'm actually an atheist, atleast untill i have an experience that convinces me otherwise. But i believe in magic, i can't say i understand completely how it all works but I'v resolved it enough in my mind that it fits my views on the world.
However if i were to use a magical system that works on the principle that god or many gods are real, my understanding is aslong as you can temporarily suspend disbelief(and i think i can) then you should be ok with the right focus of your will and belief.
As for the Arbatel, im not completely done it yet but iv read most of it and skimmed some of the rest, it wasn't as complete as i thought it would be so i will check out that sigil book you mentioned, i think i had it at one point. Also forget who mentioned Hagith in the beginning, but in the Arbatel it doesn't mention Hagith as having anything to do with addictions, so im wondering if anyone knows what source thats from.
As for the Nordic systems I think its best that i keep that on the backburner untill a time in which I'm better suited to dealing with everything it has to offer good or bad.