Hello Simon--Glad you made it back. I am Laura and I have been clean from alcohol and marijuana for over 17 months. I understand how sneaky the pot can be. I don't have any magic words to help you stop, but I can tell you what worked for me. I had to commit myself to a face to face program of recovery. I found new friends and completely changed my way of living. I learned that I do not have all the answers and that I had to be willing to do anything to stay clean. You can do it too, if you really want it.
Again, I am glad you decided to come back here. Keep posting and let us know how you are doing.
Hugs--