I'm 20 years old and have been smoking for about 3 years now.
On friday night, I had smoked many cigarettes. Towards the end of the night, I began feeling somewhat winded. I lit another, and felt better on my walk home. Then, on saturday, I maybe had 5 cigarettes and began to feel winded again. I refrained from smoking all of sunday, and had 1 today. I don't feel winded, but my breath seems more shallow than usually. I have a slight numbness in my chest, but I think that is from trying to cough everything out.

Does this sound serious?

I am quiting on April 22nd, the day after exams.