香烟伤肺不伤心
[xiāng yān shāng fèi bù shāng xīn]
A metaphorical expression "Cigarette Smoke Hurts Lungs but Not Heart". Smoking cigarettes hurts the lung physically. This statement reflects that some people tend to believe smoking is their emotional support when they are emotionally down. But cigarettes actually don't affect people's hearts directly - instead, it harms the body gradually.