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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.
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