"What's right isn't always popular. What's popular isn't always right." by Albert Einstein

This quote means that what "cool" people think is "cool" is not always a right thing to do. And even when people do right things that other people might not find cool to do is not a bad thing. So it does not matter if you are doing something good and if you are alone at it because you are doing something you like. Also not because "cool" people are drinking and smoking does not make is good to do. So you should follow your own path because it all depends on you.