Final answer:
An effective hook for a cause-and-effect essay engages the reader and captures their attention with a thought-provoking question.
Step-by-step explanation:
An effective hook for a cause-and-effect essay is the one that captures the reader's attention and makes them interested in the topic. In this case, the hook 'Have you ever thought about what smoking does to you?' is a good option because it engages the reader by posing a thought-provoking question.
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