Did it ever occur to you that it's the principle of the matter, not just how high you were or weren't off of "one toke" that you "don't smoke anymore?"
You're smoking an illegal drug, getting into a vehicle and illegally driving it down the road putting yourself and others at risk. Whether or not you deem yourself to be impaired or even altered does not matter, the fact is there is an affect after "one toke," perhaps it's not noticeable to you because you're a fucking pot head who smokes three bowls a day, but it's still more than you should have in your system when you're out driving around and putting other peoples lives at risk.
Did the fact that it's illegal ever come into your thought process either? Obviously not.