answer: #Person2# rejects #Person1#'s invitation for a cigarette because #Person2# wants to give it up. #Person2# thinks smoking is nasty but #Person1# couldn't give it up. #Person1# argues #Person1#'s done it hundreds of times.
documents: #Person1#: Would you like a cigarette? 
  #Person2#: No, thanks. I've decided to give up smoking. 
  #Person1#: Really? Why? 
  #Person2#: Well, it's just that I think if you don't enjoy doing something any more, you should stop doing it. 
  #Person1#: I see. You mean you don't enjoy smoking any more? 
  #Person2#: That's right. You should give it up, too. It's bad for your health. 
  #Person1#: Stop talking like my mother. That's what she keeps saying. 
  #Person2#: But it's true. It's a nasty habit. I can't think why I ever started. Anyway , it's obviously got you in its grip ! 
  #Person1#: What do you mean? What are you talking about? 
  #Person2#: I mean you couldn't give it up! 
  #Person1#: Who? Me? Could't give up smoking? Nonsense! Of course I could! I know I could! 
  #Person2#: How do you know? 
  #Person1#: Because I've already proved it. Smoking's the easiest thing in the world to give up. I've done it hundreds of times!