I'll tell you one thing. If the girl is smoking pot in a way that can be recorded by anyone -- exactly as she did, and exactly as it was -- then that just stepped-up the problem by a thousand times. Because unlike a "normal" girl, Malia knows how widespread the consequences will be from exhibiting that behavior. But she did it anyway.
So that fact alone indicates a way more serious problem than many of you want to admit. It is much more than a teenager experimenting with pot. She is lashing out, hard, against her parents.