Smoking or Fast food?

The scene that stuck out in my head was when Morgan talks to David Satcher who is the first surgeon general to bring up the topic about obesity taking over smoking as the number one cause of preventable death. And then he has lunch with Jacob Sullum who is an editor for Reason Magazine. That scene really sticks out because it shows perfectly, what is politically correct to say and what isn’t, and how it has changed over the years. There are many things that can kill us in this world, but why is it ok to say; Smoking is disgusting and can kill you but it is not ok to tell someone they are fat and eating that crap will kill you? 20 years ago teenagers were smoking as they walked out of school now we aren’t allowed to smoke inside or with in 20 feet of any building. Does that mean within the next 20 years we won’t be allowed to eat fast food? I don’t think it should be politically correct to say your opinion to smokers but not fat people and not only fat people because many skinny people also eat fast food. When will it be socially expectable to confront people about eating fast food?