WD-40 isn’t one magic thing—it’s a cocktail of hydrocarbons and a little bit of CO2 to blast it out. Think of it like a very aggressive bottle of perfume that’s been drinking gasoline. Your lungs are not equipped to party with these chemicals.
The main ingredients are things like naphtha and petroleum distillates—fancy names for “stuff that dissolves grease and also your lung lining if you’re not careful.” Your body’s reaction? A swift and unamused “What the heck is this?”