Secondhand smoke contains fewer carcinogens than the smoke a smoker inhales.

Question

Quizplus · Accepted Answer

Secondhand smoke actually contains more carcinogens per unit volume than the smoke that a smoker inhales. This is because the smoke that a smoker inhales is partially filtered by the cigarette and the smoker's respiratory system, and therefore some of the harmful chemicals are removed before the smoker inhales them. However, when a non-smoker is exposed to secondhand smoke, they inhale the smoke directly without any filtering, and therefore they are exposed to a higher concentration of harmful chemicals.

Secondhand Smoke Contains Fewer Carcinogens Than the Smoke a Smoker