I really appreciate all of the comments. I've not wanted to add any updates because reading so many different views has really helped. My wife actually jumped on last night and read them as well.
Last night my wife and I took our daughter for a drive to talk about it. The advice of not going balistic was helpful, though a few times my wife and daughter had some points yelled at each other. All and all a great conversation.
She has been smoking it for about a year. How we missed it was easy. Any signs of use or hints that did lead to questions always resulted in her friends fault. Now we know.
Her friends are a mixed bag, many college bound, others not. Some smoke it, most have at some point. She has been smoking it about once a week for the past year, so not an expirement. I agree that it is not going to kill her per se, and in the spirit of open communication acknowledged that many people smoke weed and have very successful lives. The worry with her, her own concern, is that it was masking feelings of insecurity and feeling alone.
She is really popular but doesn't like big crowds. She gets invited to Southern style parties (all Christian girls who are pretty "churchy" in her words) though she doesn't feel comfortable there. She has some underlying issues she wants to address to include her relationship with both my wife and I. My daughter is also concerned that she feels addicted to smoking weed.
The conclussion is she doesn't want to smoke anymore and getting "caught" was more her effort then ours. She is concerned about it being a habit and addicted, which is now my concern. I've always been told that weed is not additive but my daughter does not agree. And the best is she wants to work on her relationship with us. Having two daughters ten years apart my oldest daughter was an only child for ten years and with the new one she has felt ignored and abandoned to some degree. Two issues to sort out.
My wife and her are off to run errands today and sort out next steps. All in all a very big change in our lives, as she is obviously not a little girl anymore in many ways. One fun thing, she likes to do what her Dad does. It would seem she might get her own Aces High account. I'm not sure about that but if she does....I've taken her to about every airshow and museum within 12 hours driving distance her whole life. It would make sense.
Thanks to all of the discussion and suggestions. It was really helpful. This "game" is much more then wasting time BnZ'ing the oblivious noob.
Boo