Documents Lesson 1 Why should you avoid cigarettes? Cigarettes contain 43 known carcinogens, including...

Slide 1 Slide 2 Lesson 1 Why should you avoid cigarettes? Cigarettes contain 43 known carcinogens, including cyanide, formaldehyde, and arsenic. The Effects of Tobacco Use…

Documents Respiratory system

1. The RESPIRATORY SYSTEM 2. • Breathing is the movement of the chest that brings air into the lungs and removes waste gases. –Air entering the lungs contains oxygen…