A good metaphor for addiction is speeding. You're driving down and empty highway, you want to get where you're going faster. You're not going to actively look down at your speedometer. You know you're probably breaking the prescribed limit a bit, but who cares. The when you finally are faced with looking at the speedometer, say when you get to windy section or a speed trap, you look down and you're going 25mph over the limit and you have no idea how you ended up going so fast, but by that time, you're brakes are squealing or worse.