Which is also true, but the statements are not equivalent. Tobacco use (and actually, all forms of smoke inhalation) has a specific, acute mechanism whereby us

Which is also true, but the statements are not equivalent. Tobacco use (and actually, all forms of smoke inhalation) has a specific, acute mechanism whereby use increases the chances of lung cancer and other respiratory problems. We do not have that kind of causal link for obesity-related diseases. There is a correlation between weight and several so-called lifestyle diseases, but the causal link is fuzzy. That lack of causation is why reducing the obesity problem to a simple matter of weight control is a bad idea. There are other mechanisms at play, particularly related to body composition, that appear to be sensitive to diet composition and activity levels. Telling people they can be sedentary as long as they don't eat too much (which is basically what the original post I was replying to was saying) is dangerous.