It must be hard and shocking for you to get know that your teenage daughter smoking marijuana. It's not something what give wings to parents. As person below said - sincerity of your kid is good sign.
It's understanding that you don't want her to keep smoke. Have you talk calmly with your daughter honestly that you don't like it? Did she tell you why she reached for marijuana? Maybe she has problems which she can't cope by herself or maybe she just was bored or curious?
I think it's better talk with her, without yelling and get nervous. Tell her sincerely that you're really upset. It's worth also to make her aware about consequences of smoking marijuana (you'll find them on google). If she has some troubles, tell her that you can try help her if she tell you what's going on.
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