It happens over time your lungs turn black and have tar build up on them, plus cigarettes contain carbon monoxide the same stuff that comes out of a car. Lung caner just doesn't happen but it can laugh now suffer later.
you can tell you are only a teenager! You are too dumb to know any better but life will eventually knock you on your butt and you'll regret being so dumb!
this is funny,
because your so stupid.
you do know that tar builds up your lungs over time?
6 years is nothing, carbon monoxide moves through your system entering your tiny brain, staining your already yellow teeth yellower and turing the lungs and your soul blacker. you just dont understand do you?