I'm not really sure if we have air bubbles, per se, in our lungs. Trauma or an injury can cause our lungs to collapse, and we can get air pockets in and around our lungs that need a chest tube to get the air and possibly blood out, and that re-inflates the lung, but I've never heard of an "air bubble" going to someone's heart from their lung and killing them. That doesn't mean it can't happen, just that I've never heard of that happening. You absolutely can have blood clots (called pulmonary embolus), that can form quickly and travel to your heart and kill you.
