9. Sports Drinks
Sports drinks may not directly lead to cancer, but they provide a stepping stone along the way. Though marketed as healthy, sports drinks are loaded with sugar and carbohydrates. And unless you literally work out all day long, they are unnecessary too.
Stick to regular water for the most part, because the extra calories in sports drinks can lead to obesity and type 2 diabetes, both of which are linked with an increased risk of developing cancer.