I quit drinking and smoking. Of those drinking was probably harder but neither was very hard for me.

The key is to avoid situations that trigger your addiction. Don’t buy any of the products. Don’t hang around people that use them. Don’t go to places where people use them. And so on. This might mean you need to get new friends. It’s unfortunately the way it is.

That’s why it’s harder to quit more ubiquitous things (like eating sugar). And it probably varies from person to person