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Question:

Which idea about the effect of smoking on health is included in the passage?

A Secondhand smoke is proven to contribute to a number of serious illnesses, including cancer.
Explaination

This fact is taken directly from the first sentence of the passage. Note that answer Smoking on duty is only allowed during break periods is from the passage as well but does not align with the rest of the question, which asks for an idea about smoking’s effect on health.