 The agency says smoking harms nearly every organ in the body, including your skin, which brings me to this new study I want to tell you about, as more and more scientists are starting to think about fat as its own organ. Researchers in Sweden found that smoking might cause an increase in visceral fat. That's the worst kind of fat. It's not visible, but rather it's deep under your skin, enveloping your organs and resulting in a lot of inflammation, which can lead to a host of chronic diseases.