I'm going to tell you right now that you do not have lung cancer!! My daughter has asthma and Spring is a terrible season for asthma patients. I am also going to tell you that if you don't stop smoking, you are going to end up with some serious problems, that asthma patients get who smoke. My daughter is 21 and uses her inhaler a lot during the Spring time. She has also been using her allergy meds as well. She has what they refer to as "true" asthma. She gets attacks all year long, but they tend to be a bit stronger during the spring.
You need to be on allergy pills and stop smoking. You will see the difference in how your chest feels, and how often you are using your inhaler.