This is a powerful presentation done by a teacher at the Yan Chai Hospital Tung Chu Ying Memorial School in Hong Kong. He was worried how his students started

Source: This Is What Happens To Your Lungs After You Smoke 3 Packs Of Cigarettes

Smoking kills! I know you know that. I finally quit smoking this year and I’m so happy I did. Are you still smoking? See the video and I’ll bet you quit to.