You Know It's Bad, But You Do It Anyway. Let These People Tell You Why You Should Stop. Immediately.
I know what you're gonna say: "I've heard this message a million times. It's on every billboard and public service announcement everywhere, all the time." Know what I say to that? "Yeah, but have you actually heard the message? Uh, are you still doing it anyway?" Maybe you won't after you see this. I'm totally willing to be redundant if it makes a difference. So there. (Oh, quit rolling your eyes and just click Play. Also, maybe get a tissue handy.)