You are probably familiar with the phrase, you can take a horse to water but you can't make him drink. I think the same is true of teenagers and readers. The best you can do is to get a good selection of readers suitable for your students (you could look at
http://www.easyreaders.dk for some titles, particularly the teenreader titles, and invite, encourage your students to read. Good luck
Jeremy
http://perso.wanadoo.fr/jeremytaylor/for teachers.htm