6 Surprising Things That Can Cause Killer Hangovers

You only smoke when you’re drinking, right? Well, here’s extra incentive to drop the habit. In a study of college students published in the Journal of Studies on Alcohol and Drugs, participants who smoked and consumed alcohol in the same day were more likely to report suffering from worse hangovers. So think twice before you light up next time…or pay the painful morning-after price.