Which of the following poses the greatest threat for the development of lung cancer among nonsmokers?

Name: Which of the following poses the greatest threat for the development of lung cancer among nonsmokers?
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Question

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Exposure to environmental tobacco smoke, also known as secondhand smoke, has been shown to increase the risk of lung cancer in nonsmokers. In fact, nonsmokers who are regularly exposed to secondhand smoke have a 20-30% higher risk of developing lung cancer compared to those who are not exposed.

Which of the Following Poses the Greatest Threat for the Development