Hello. I'm An Active 32 Year Old Male Smoker. I

Hello. I'm an active 32 year old male smoker. I lift heavily 5-6 days a week and eat healthy. For the last month I've been off of my diet for the last month. Since I haven't been watching what I eat, I've had shortness of breath. It's been progressively getting worse. I also recently had chest pain. I felt like something was squeezing my heart or lungs or something. I'm getting back on my diet immediately and not having another cigarette. My question is, is there something else that I should be worried about? This is the first time I've felt these symptoms and I've been on and off in the gym for years. Thank you for your help.