单选题：What is the main idea of the article Cigars: Health Effects

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题目内容：

What is the main idea of the article Cigars: Health Effects and Trends? A．When it comes to cancer, cigars are not any safer than cigarettes.
B．Cigars may be addictive while cigarettes are not easily so.
C．Cigars contain less harmful substances than cigarettes.
D．Increase in cigar-smoking does not affect public health much.

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