When somebody keeps doing drugs and gets an ego from it, when it is the root of why the person shouldn't have an ego. This is also ironically what makes it even harder for the person to quit the habit.
Josh: Yo dawg, wanna smoke some of dat supa fire?
Victor: I'm kind of busy right now... I have, er, a lot to do today...
Josh: Aight dawg whatever mang... more for me fool! Stay chill dawg.
Victor: *Facepalms to himself knowing the Egotistical Drug Irony*