Given the question: Answer the following question given this paragraph: Secondhand smoke , which comes from breathing the smoke release from tobacco products. Secondhand smoke is also the smoke exhaled by a cigarette smoker. This smoke is extremely dangerous to human health. Q: What is the health-threatening smoke exhaled by a cigarette smoker or released from tobacco products? Choices: - secondary smoke - contamination smoke - primary smoke - secondhand smoke A:
The answer is:
secondhand smoke