Chest and back tightness

If anyone can please help me I’d appreciate it more than you could ever know. I am a 27 year old male who has been a heavy smoker since 17. My whole life I have battled with anxiety and a panic disorder. Recently, (about 2 months ago) I stopped smoking cigarettes and switched to the juul. I have never seen an allergist before but can guarantee I have terrible allergies and possibly even asthma as I do wheeze often. 2 times a year every year my chest starts to hurt I don’t feel good and end up on a Z-pack. As of now since quitting cigarettes and smoking the juul I feel worse then I ever have. My chest is extremely tight but what’s even worse is the tightness in my back. It feels as if my lungs are in actual pain. I also cough up mucus that has black specs throughout all of it. Is this normal? I have felt like my chest and back are in a vice grip for the past 2 months. Some days worse than others.