Strange question. when i chew gum i get sob, feel like i can't take a deep breath. it lasts awhile after throwing it out. what could cause this?

R/O ALLERGIC RX: It. May be an allergic reaction. Causing an asthma flare. Follow up with your doctor and an allergist. Bring the gum with you and see if they can screen you for any of the ingredients or dyes for color

Sinus congestion: can cause it to be somewhat harder to get air through the nasal passages into the lungs. It is common for people to breath through their mouths to compensate for this. That is why people with sinus congestion often awake with a dry mouth (from mouth being open for breathing during sleep). Chewing gum can make breathing through the mouth less efficient and result in shortness of breath.