Recently ive been expieriening lung tightness late at night while smoking. now ive been smoking regularly for 5 years now(weed). im very active and run a couple miles a week. if i smoke in the daytime i expierience no tightness whatsoever. only nigh?

Quit smoking weed. It will damage more than your lungs. Marijuana is a psychoactive drug and will mess with your brain. MJ users are called stoners for good reason.

You need to stop smoking. Smoking can cause your symptoms. The framing of your question is trying to describe that you are otherwise healthy because you are running, if you are smoking, no matter how you feel or run you are not healthy.