I quit smoking 48 days ago. Longest Ive ever gone voluntarily. My question is this. Since I quit smoking Ive had issues with getting a full breath at times. It feels like Im trying to take a deep breath but my lungs didnt get enough air. After a few attempts I may yawn and sometimes that works. Sometimes it causes discomfort in my chest like a very mild tightness. Has this happened to anyone else? Should I be alarmed. I have gone to the doc and he said my lungs sound clear that my oxygen is normal.