Don't be ridiculous. Of course lungs do not take 100% of the chest. making that an argument is well SILLY. You are either playing semantics now or backpedaling.
Lungs take the majority of space in the chest. then goes heart. there's little space left. But lungs do not take 100% of it no no no. they take like 66% and heart takes 33% and 1 percent is spread out in space between them. Go hit it soldier.