I’m a big fan of Duke professor, author and researcher Dan Ariely, and have written a lot about his work.
Here’s a video of a talk he gave on self-control (you can find the transcript here).
It’s really quite good. Unfortunately, I think most of the examples and stories he uses — which are great — would just be too hard for high school students to connect with, and apply to, their own situation.
Nevertheless, I’m adding the video to The Best Posts About Helping Students Develop Their Capacity For Self-Control.