Asparagus Pee Why Only Some People Smell It Asparagus may cause a unique odor in your pee-pee. It is commonly known that consuming this green vegetable can cause a pungent whiff during a trip to the restroom. If you see an unpleasant aroma once you've indulged containing asparagus, do not be alarmed. It is simply a typical response that occurs physiologically. Feel confident that the scent is harmless and will fade over time.