As some of the others said your best bet is a dialogue. Find out what they listen to, what makes it work for them and then sing something that realtes to that idea. the idea is to help them see that they are not the first and they are not alone in their feelings. We have all been young and we have all experienced the trauma of youth. And some of us, unfortunately, did not make it. I believe that happens because they do not realize their feelings are not unique, that they are just feeling the way kids have always felt. And because they don't know what to do about it.

Hmm, getting off track here. Anyway, the idea, as was clearly stated above it to communicate clearly whatever your intention is. If you are only to entertain then do so. If you want to teach you might want to sneak that into a performance. "Here you go, guys, a song of youth and drug dependency. It just happens to be 50/100/200 years old."