Smoke
"If the risk of lung cancer, emphysema, heart disease, and stroke aren't enough to scare you off cigarettes, how about all those wrinkles you'll get?Study after study shows just how extensively smoking ages the skin. 'It does a lot of what the sun does. It just does it inside (the body) instead of outside,' Dover says. 'It makes the skin weak, tired, and listless looking.'
If that weren't enough, smoking also yellows the skin, interferes with its blood supply, and slows wound healing. 'So if you injure your skin it may not heal as well if you're a smoker,' Levine says."