We cannot stress just how dangerous it is to smoke, but you already know that. Perhaps another way to shock you out of the habit is to show you what you'll look like if you don't quit.

The Cancer society of Finland has devised a sick way of showing the effects of smoking on the human body. They use before and after examples.

You can click the categories on the side to focus on certain body parts like hair, acne, lungs and weight gain. It isn't pretty:

And for guys who smoke, your penis will shrink and shrivel. How un-awesome is that? Check it out:

Go here to check out the comparisons yourself. [Tobacco Body via Street Anatomy]