I'm 20 years old and have been smoking for about 4 years now. On friday, I was out with my friends and was smoking cigarettes for most of the evening. I began to feel out of breath towards the end of the night (I had never felt that way before). The next day I had maybe 5 cigarettes and the same thing happened. Today, I haven't had any and feel ok, I've been drinking alot of water.

Could this be an infection of some kind or some sort of illness?