Need Help...

Ok so I have been keeping up the good fight and its been over 2 weeks now. I would say a majority of the negative side effects have gone away for me... ( cravings, insomnia, etc. ) I am still getting a tightness in my chest, not painful but persistent and annoying. I am wondering if that is because I have not been coughing up any of the crap im sure thats in my lungs since I quit. I have never been a big cougher ,stop smoking now, even when I smoked.... should I take a decongestant to try and help loosen something up ? I can breathe through my nose fine 90% of the time,quit smoking now, but sometimes in the mornings i'll have some blockage ...it usually goes away after 10 minutes. I am just surprised that I haven't coughed once since I quit , does that mean my lungs aren't healing at all? The tightness in my chest I was pretty sure was either congestion or soreness from coughing so much.....I run 5 miles a week and workout with weights 6 days... I noticed I can breathe alittle easier when I run but when I get home and start watching tv I notice my breathing just seems alittle off normal. That's when I mostly notice the chest tightness... I can feel the slight pressure right in my sturnum ...