smoking-bad-skin.jpg Eating excess sugar makes the skin pores to swell, the enlarged pores trap skin oil and dead skin cells. This eventually leads to red, blotchy skin and acne, according to Kauffman, an aesthetician at the Center for Cosmetic Dermatology in York Township. Smoking can cause sagging, wrinkly skin around the lips. Smoking stimulates wrinkles, as it degrades collagen. The same way excess intake of alcohol dehydrate skin leading to dark under-eye circles and red blotchy patches.