No matter your age or skin type, there are a few things that should never happen to your delicate skin. Commit one of these seven deadly skin sins, and you'll pay the price in blemishes, wrinkles, skin cancer and more. First, if you're a smoker, kick the habit for your health and the health of your skin. Secondhand smoke isn't good for your skin - or those around you - due to the free radicals it releases....