smoking, belching, cursing
That last one is actually quite annoying because my colleagues also made a habit of cursing due to my influence and now I know how annoying I am. Damn. But I'm radically healing up, in the mid 90s it was in my habit to destroy equipment at my workplace regularly when I couldn't stand the stress anymore (a display, numerous keyboards, throwing various objects around, I even threw a phone through a window to the other office once, jeez).