... feeling right in the middle of my chest I have never had asthma Ive been smoking since I was 14 im now 18 but I don't smoke a lot I do it like sometimes every other weekened like 2-3 cigs/cigars sometimes more but not often after that I went to vaping still smoked but not as much after that I vaped probably every weekened my oxygen lvl is 98% spirometry test didn't pick up any breathing problems I'm kind of worried what it could be!?