Robb has a very good sight he sent me to one day that gives the deer anatomy in several different shots- it was good!!!!
IMHO, I think you would have to hit very far forward to miss the lungs- that is you would have to hit forward of the lungs- no matter how high or low you shoot. A deer's plural space goes all the way up to the spinal cord, no matter if the deer is inhaling or exhaling. If you miss the plural space- your gonna hit cord, you miss the cord- your gonna hit the plural space.