Good answer? Sign In jannrn 104 Posts Specializes in Med/Surg, Perinatal, Float. Has 14 years experience. on the subject of breath, I have smelled the worst chemical smell (that gives me a headache) from pts recently back from surgery. can anyone in OR elaborate on what exactly that is from? A certain gas/anesthetic?also, no one has mentioned asparagus pee! ew!