Quit watching porn, after realising the health risks are not worth the benefits.
Quit buying sweets of any kind, especially sugary ones, for myself. I still buy chips for everyone when meeting with friends. I still eat sweets as long as they are made at home. And yes, I have cheat days. So it's not perfect.
The benefits trickled down, phone usage went down etc. etc.
So I got into the habit of quitting, and seeing things for what they are.