What does the sentence "... it is better to refrain from smoking" mean? What does the writer suggest people do when they finish

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问题 What does the sentence "... it is better to refrain from smoking" mean?
What does the writer suggest people do when they finish smoking?

选项 A、Throw the cigarette end (烟头) on the floor.
B、Try to blow off the ash.
C、Keep the cigarette end burning.
D、Use an ash receiver and put out the cigarette completely.