Rat: "You have to remove all the smokers, and then you'll get cleaner data" Rat's grandma is a former smoker. She smokes like two years when she was in her thirties, and now she's 97. The reason why you have higher death rates among super skinny people isn't because they're like super skinny people that like post photos of themselves and backines. They're old people who are wasting away from some sort of pre existing illness.