It hurts physically like breathing in bleach or smoke (I have asthma). I am allergic to garlic if I eat it, also confirmed by allergy testing
too. But I was told I had to come in contact with food allergy to have an allergic reaction to it.
The smell of it makes me very ill, triggers asthma, dry tight throat, mucus, even vomit. It's a brutal feeling. Very few odors hurt me like this. Bleach and smoke are the other two that hurt but only garlic makes me feel ill beyond breathing problems.