I think if you are at a lost, you should consult with a therapist or psychiatrist. Maybe it's a behavioral problem that you alone might not be able to fix!

You might see if you can arrange for her to visit patients in the hospital that are dying of lung cancer, emphysema, or mouth cancer.

Look into this site and decide if you can use it to help dealing with her behaviors. http://joy2meu.com/Personal_Boundaries.htm

This may seem harsh, but if the smoking is going on at school, then I would contact the principal. Tell him/her what your daughter is doing. Ask him/her to take the appropriate measures to stop her. She may be a little upset when she gets suspended for smoking on school grounds; but, it may save her from becoming a pot head. Possession of pot is a crime. If you can address the problem at an early age, you may just keep her out of jail. Since she is smoking on school grounds, then the school should be informed anyway. If you have the courage, I would tell her that you were the one who turned her in too. Sounds like a little "tough love" is needed here. Good luck! If you wish to, please post a comment on how things turned out.

"pots good for you"...geez. I don't know if she hasn't been educated enough about drugs or if she is just choosing to ignore facts. If you have done groundings, taking away privileges, no video games, TV, allowance, etc. etc., then I would contact the principal and tell them specifically what she is doing. Your daughter will be upset and angry, but you are her parent and it's your duty to look out for her. If the school's intervention does not work, that's when I would go to the police to handle the matter. I'm sorry that you have to go through this.

15 is actuallly a better time to get into to it as they eventually get over it in a few yrs, im an ex pothead myself, i dont encourage it or denote it i accept certain circumstances under the exceptions. has she had any form of major trauma ranging from sexuall assault to maybe being mugged. if there are no real reason for smoking it the person will usually quit, but then again does she have an addictive personality, there are so many options to look at when you help a person with an illegal substance habit. why is your child is doing weed? and fun isnt an answer thats when you slap her and send her to rehab. What are the pro's and con's suited to her personal situation, are her grades slipping (not as stupid a question as it seems i got a double diploma in hotel managment stoned off my nut when i was 16 with credits, im a productive stoner)the hardest part ive found when a person so socially invovled with drugs etc is when and if they do quit your now stuck with well i was known as a stoner at school, who am i now? great support can erase this state of mind and encouraging other personality traits such as if she sings around the house, draws or what ever it is that makes your duaghter specail, other than her friends saying 'yeah that chick can punch cones like a dude'etc which encourages her to smoke more. remind her that the drugs dont make you a better person, dont go into how pot gives you phsycosis and memory probs in the long term as the rebel iside her will say 'brain shutdown' dont wanna know etc. in my experiance with dealing with drug users (pot and the rest if that yukky stuff) the only way to quit is if you want to, its unfortunate but true, and ecouraging positive behaviour eg 'wow your hair is looking so healthy and beautfull when your not smoking' or something like that, is a big helping step to subliminally educating her on the benifets of not smoking, then if she does quit weed or tries too dont mention the word (weed, pot, grss, joint, baccy etc), no visual images of the drug or its associates (rolly papers, bongs etc) and then the hardest part of all(although in the end it was the easiest)getting rid of those drug f****ed friends,(all these things are an encouragment to smoke more) i moved interstate for example, i came form trailor trash so it was a case of bettering my surroundings to change my mindset of how acceptabe drugs are in school and modern life altogethor. most of all dont be afraid to be mean, cos your not, your being a parent. i wish i had a mother who would be so supportive of helping me give up such a 'kool-to-the-kids' habit. while detoxing the first two weeks will suck there may be 2-5 nites where she wont eat or sleep as the weed has slowed down her brain to the pots level and now the brain is coming back to the normal speed of reality. anything said in this period of time IS JUST the drugs talking, she might scream at hating you, your ruining her life, etc but she'll get over it and thank you in the long run. if you have any questions, im here, i go down many different paths to solve other peoles drug problems i even managed to quit myself in the last yr, twas hard but iused to smoke around an ounce a day everyday from the age of 11-20 so it is possible its just a problem that needs to be solved positivly and peacfully, as any stress during the quitting time is gonna make you run straight for that damn bong.

Well being pretty young myself, I would suggest not calling her principal as that is an east route and also humilating. She has opened up to you about smoking pot which is pretty big on it's own. Alot of parents don't know what their kids r up to, trust me. You want to be teach her a lesson but also keep her open with you. Pot I feel like isn't that huge of a deal but I see it being at 15! I mean teens do I'd to feel an in or seem cool and to be honest that fades when highschool ends. All you can do is guide her and interveen if she's getting into any hardcore drugs and I know pot can lead to other more serious drugs! Just love her and be open and tell her it's not ok and u don't agree and like someone else said take her to c some people who are dying from lung cancer, rather than punishing her in childish ways and treating her like she's 10 and making her run from you and rebel, touch her and give her reality! Good luck!