Getting shot in the lung is a very serious thing because your lungs allow you to breathe.
If you get shot in the lung you need medical attention right away to survive and you will need to undergo surgery of the lung to remove the bullet and stop any bleeding inside the lung.
When a person gets shot in the lung the lung can have internal bleeding and you could drown of your own blood.
You still may die of being shot in the lung but prompt medical attention and surgery can increase your chance of survival.
My brother got shot in the lung about 10 years ago when he was out hunting with a friend and the friend accidentally shot him.
He was not supposed to live but the surgery went through just fine and he lived and is doing great now.