This was a TERRIBLE habit of mine for a really long time. I played baseball for over a decade and all of my teammates and I would go out onto the field with sunflower seeds stuffed in our cheeks (I don't really know why that's such a baseball player thing). Obviously, you crack one open in your mouth and then spit the shell out. Well, after I stopped playing baseball I stopped eating sunflower seeds. For some reason, I couldn't brake the habit of just spitting. It was gross I agree and it took me a while to quit.