Once an old man went to a doctor. The doctor looked him over carefully and said, " Medicine won't help you. You must have a good rest. Go to bed early, drink milk, walk a lot and smoke one cigar(香烟) a day only. Go to the countryside for a month. "

A month later, the old man came to the doctor again. "Glad to see you again. How are you?" said the doctor. "Oh, doctor! I feel quite well now," said the old man, "I had a good rest. I went to bed early, drank  a lot of milk and walked a lot. Your advice were very helpful to me. But you asked me to smoke one cigar a day and it almost killed me first. It's not a joke to start smoking at my age! "