I don't think that being addicted can be attributed to a person's level of intelligence. I don't think that he realized early on that the drugs would do so much damage. Even though he had the 'pill books' and studied the effects of certain med's, I still don't think that he took into consideration the effect it would have on a long term basis. And most likely, by the time it did register with him, it was far too late for him to do anything about it. He became addicted. He didn't seek help. And sadly, it cost him his life.