Whether or not you were a sun worshipper, chances are your skin has sun damage. About 90% of all skin damage is due to the sun. As your time in the sun goes up, so does your risk of skin cancer. Protect skin by always wearing broad-spectrum sunblock, wear wide-brimmed hats and long sleeves, as well as avoid the sun between 10 am and 2 pm when rays are strongest.

Too much alcohol is bad for your skin and your body. Alcohol is a diuretic that causes the body to lose water which contributes to dry skin. It also dilates blood vessels. That's why drinkers often have red, flushed faces. Over time, these blood vessels can become permanently damaged so that the skin stays red. Alcohol, especially red wine, can also trigger rosacea flare-ups.

Simply put, smoking is bad for your skin: It's second only to the sun in causing premature wrinkles and dry skin. In fact, under a microscope you can see wrinkles in smokers as young as 20. Smoking reduces blood flow to the skin and contributes to the breakdown of collagen. Less collagen means more wrinkling. And yes, pursing your lips repeatedly encourages wrinkles, too. You can't reverse the damage, but you can stop it by quitting smoking.

Cold weather and wind bring on dry, flaky skin and can make eczema and rosacea worse. It's not only the weather outside, but dry heat indoors is also harsh on skin. Fight back by using a humidifier at home, drinking lots of water, and applying moisturizer throughout the day.

Every day, your skin comes in contact with pollution, cigarette smoke, car exhaust, and/or smoggy air. Keep skin healthy by keeping it clean. Depending on the needs of your skin, you can cleanse your face with gentle cleansing milk, exfoliate nightly with gentle scrubs to remove dead skin cells, and apply a moisturizer twice a day.