Which of the Following Is True of Smoking

Which of the following is true of smoking?

A) People who inhale secondhand smoke regularly are at a lesser risk of the same health problems than those who actually smoke.
B) Smoke burned from the end of a smoker's cigarette is low in carcinogens as compared to inhaled smoke.
C) Smoke burned from the end of a smoker's cigarette is high in carcinogens.
D) Smoke burned from the end of a smoker's cigarette is not a health threat to those who inhale it passively.