Mods I have no idea what "topic" this would go under, feel free to move it to a new home.

Ok, this may sound really strange. A few weeks ago I tried some "fat free" butter (on my grilled cheese) since it was in the house, no taste, boring, and I noticed afterward that when I "puffed" my cheeks out and filled my mouth with air I could breathe out white smoke, like I was smoking (i dont nor have I ever smoked). I was pretty impressed and thought it was from the butter, my mom even noticed it from about 6 feet away. Lately ive been having trouble breathing deep (and having to really try to fill my lungs), and coming home from work I noticed that when I puffed my cheeks I could breathe white smoke out. Can anyone explain this or if its bad? The past year I havent really been active (sittin around, no job). If anyone can provide me with any information I would greatly appreciate it. Thanks.