Smoking is very harmful. It hurts almost every part of your body, including your lungs, heart, brain, liver, kidneys, and even your skin and bones.

When you smoke, you breathe in thousands of chemicals. These chemicals go into your lungs and then into your blood, travelling through your body. Your lungs try to clean out the sticky tar, but over time they get weaker. People who smoke for a long time often have black lungs.