Would you like a cigarette ?   No , thanks . I've decided to give up smoking .   Really ? Why ?   Well , it's just that I think if you don't enjoy doing something any more , you should stop doing it .   I see . You mean you don't enjoy smoking any more ?   That's right . You should give it up , too . It's bad for your health .   Stop talking like my mother . That's what she keeps saying .   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 !   What do you mean ? What are you talking about ?   I mean you couldn't give it up !   Who ? Me ? Could't give up smoking ? Nonsense ! Of course I could ! I know I could !   How do you know ? 