Drug Dialogue

There was a sub for Mrs. Gorrell today (APS is processing my sub application like a sloth full of molasses.) It was inevitably an interesting day.
Two of my male students have been discussing drugs with me. Well, more them telling me about how they smoke weed and writing about how they get chinc-eyed and other things I did not want to hear. This dilemma was also brought up during my seminar class. Apparently the perscribed response is to tell they kids this doesn't impress you and then tell them you don't want to hear about these types of things because you may have to take furhter actions. First, would I really take further actions, or would that be an empty threat? (Let's face it, I don't really discipline my kids...) And second, is it the right answer to just shove these things under the rug? It seems silly not to discuss issues in my students' lives. Third, these two students in particular do not turn in any work and are hardly ever on task during class. They failed the first semester and I don't have any hope they will pass the second, let alone graduate high school. I don't want to seem like I don't believe in my students, I know if they wanted to do this whole school thing, they'd rock at it. I wonder if they have just been shot down so many times by the system that they turn to drugs and alcohol for relief, and then talk about it in class so they don't have to do any work...???