I'm not sure if they would do something similar these days. About a few weeks ago, I watched a program that aired on several popular networks about meth and how it affects people in many ways. It was amazingly graphic with what meth can do to people. I already knew not to take drugs like that, but that program opened my eyes much more than anything I saw before on drugs. They'll probably make the next marijuana program as straightforward as that.
Besides, I can't think of any of today's popular cartoon characters that can deliver the message.