This one is a no-brainer, and yet as of 2015, the CDC reported that an estimated 36.5 million adults in the US currently smoke cigarettes. Not only does smoking lead to premature aging, but also it wreaks havoc on your skin cells every day. This is due to the carbon monoxide in cigarette smoke, which moves around the oxygen in your skin, letting in the flow of nicotine and reducing your blood flow. End result? Dry skin and a lackluster complexion.