Final answer:
Secondhand smoke, or environmental tobacco smoke (ETS), is a dangerous combination of smoke from burning tobacco products and exhaled smoke that can lead to serious health risks.
Explanation:
Secondhand smoke, also known as environmental tobacco smoke (ETS), is the combination of smoke from a burning tobacco product and smoke exhaled by smokers. It contains over 7,000 harmful chemicals, with at least 250 known to damage human health. Exposure to secondhand smoke can lead to various health issues, including an increased risk of lung cancer and heart disease.
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