Guess Who

I am one of the most prolific running backs in college football history. I carried away some hardware my last year in college. My draft day was one of the most memorable drafts ever. Some people say I am shy cause I always wore my shades in interviews. I love football, sometimes. I had a stretch where I was the most productive back in the league, too bad I didn't have a quarterback. I walked away, then I was told to stay away. I played in Canada, lived in India, and love holistic medicine(marijuana). Now I am broke trying to figure out what to do next. The NFL called and said they would let me give it one last shot. Been back a week and now I am starting. Who am I??? And damn I still don't hae a quarterback. LOL