In other news, the sky is blue and Half Life Ep. 3 is still not out.
I really don't think this is anything crazy or out of the ordinary, we were all that age, or are that age. Being exposed to weed is gonna happen sooner or later the question is, do you care if someone your kid may "look up to" smokes it? I have no kids so I can't speak from experience, but in the first place I'd tell my kid to watch better shows.
Daughter: "I want to watch Hannah Montana"
Me: "NO, let's watch Madmen"
Obviously I'm joking, people, let's not have the television teach our kids values.
Edit 2: Found another one:
Also, it seems like it's either her first time or she just can't keep it together.