Which of the following accurately describes an effect of smoking? A. Smoking damages cilia in the trachea and more particles enter the lungs. B. Smoking lowers blood pressure. C. Smoking enables hemoglobin to carry more oxygen. D. Smoking decreases heart rate.

One of the side effects of smoking is the damage of cilia in the trachea which allows particles to entre the lungs. Smoking destroys the cilia which are key in keeping particles from getting down into your lungs so every time a person smokes more and more cilia are destroyed.