I'm 16 years old and have been smoking for about 7 months and I have recently increased how much I smoke. It's not much... I'd say I go through a 40 pack in a week. Out of no where yesterday I started to get a persistent cough, bit of a tickle in the throat. I haven't stopped coughing all night and yesterday and now again today. Very little phlegm. Chest pain but no other symptoms that could lead me to believe it's a cold. My head is fine, my nose is fine but I'm extremely tired. What could this be?