Oblivious

Oblivious, Not aware or informed: ignorant, unacquainted, unaware, unconscious, unenlightened, unfamiliar, uninformed, unknowing, unwitting.  I have to say some parents out there must be absolutely OBLIVIOUS.  Here is why I say this.  A couple days ago I was walking through the parking lot of a local supermarket when I caught a strong "aroma".  I turned to look at where this "aroma" was coming from and there was this 12-14 year old kid smoking some dope in the passenger seat of a car.  As I glanced over the second time I saw that he had a younger sister of 8-10 years old in the back seat.  From what I can deduct one of his parents must have left them for a couple minutes to get some milk or something quickly, so he lit up.  What I can not understand is how in the world would the parent not smell the weed the second they got back into the car, unless they already know or they are completely oblivious.