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A:Do you want a cigarette?
B:No, thank you. I've given up, you know.
A:You don't mind if I have one.
B:Well, all tight. But you know , smoking does do harm to your health.
A:Yes , you are right.
B:Why don't you try and give it up?
A:I've tried to give up smoking several times , but it's no use.