There are 5 main bad habits that can age a person's body and skin more rapidly: smoking, excessive drinking, greasy / fatty foods (a lot of them, for years), lack of sleep, and lack of exercise. To learn more about how these bad habits affect your body, read this article.
The following is an excerpt from a CBS news report on bad habits VS. your age -
"The risky behaviors were: smoking tobacco; downing more than three alcoholic drinks per day for men and more than two daily for women; getting less than two hours of physical activity per week; and eating fruits and vegetables fewer than three times daily.
These habits combined substantially increased the risk of death and made people who engaged in them seem 12 years older than people in the healthiest group, said lead researcher Elisabeth Kvaavik of the University of Oslo..."
12 years? That's awful. That's a lot of years, your entire childhood is pretty much a solid 10 year span, and most of your life's memories occur in that time. Imagine looking like you were born almost an entire generation earlier?! Ew.
So, the verdict's in and I'm going to quit smoking, I'm changing my diet, and I'm (probably) going to drink less. If I already have a problem with these dark bags under my eyes, I can just imagine what my problems will be when I'm 30 and a heavy smoker. Yuck!