Everybody knows that smoking is bad for you and is probably going to kill you if you indulge in it as a hobby, but it’s safe to assume that not everybody knows just how terrible it is for you.

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Videos like the one below might be able to help you understand the full horror of what smoking does to your lungs. In it, a guy uses cotton balls to simulate the lungs and what happens to them when you smoke a whole packet of cigarettes. To say it looks grim would be an understatement:

Man oh man. That really is upsetting watching. I advise you show it to anyone you care about who smokes and encourage them to stop immediately because you’ve gotta think after checking it out that there’s at least a chance that it might convince them to give it a shot after seeing such a rancid video. It’s worth a shot.

For more smoking, check out another five reasons why it’s important you quit smoking immediately. Seriously.