When I start to notice myself get addicted to something, I usually cut down because my mind wants to do it to feel really good, not to feel normal. Except with weed I smoke as much as I can because it always feels good.
so you've never smoked to the point you don't feel like you get high anymore.. and do the old "I just smoked a 2 gram spliff of bubonic chronic, right?" sounds like you need to load up that bong again