One accidental sniff usually won’t kill you, but you’ll be thoroughly miserable for a few hours. However, if you make a habit of it? Terrible idea. Those hydrocarbons can cause chemical pneumonitis—which is just a fancy way of saying your lungs throw an angry, inflamed party. You might end up with a nasty, wet cough that sounds like a drowning frog.
Repeated exposure can even damage your nervous system. You might start getting tremors or memory gaps. Picture it: you forget your own name but remember exactly where you left that squeaky door. Sad priorities.