That's why we know better now.
Once you break an addiction, it's easier to control the others, I think.
One component of working a 12-step program is to remove yourself from the source and situations in which the addiction manifested itself. The recovering alcoholic does not go out to bars with his old drinking buddies for recreation anymore for instance. The recovering smoker will generally not have a pack of cigarettes and a lighter on his desk where he used to chain smoke. Once the physical addiction is broken and the cravings abate, will power and positive reinforcement can be effective to stay off the stuff though the physical addiction is only part of it as those recovering can testify.
Compulsive disorders related to food closely mimic substance addictions. We can remove all the white flour, sugar, high fat stuff from the house, of course, but there is no way to completely remove oneself from food. Will power to not overeat is very difficult for millions of Americans trained to use food for socializing, comfort, and distraction. And, unless they are wealthy enough to have servants to do all the grocery buying, cooking,and serving, there is no way they can insulate themselves from opportunities for food excesses.
This is no way minimizes the commitment, effort, and pure heroism of those who have overcome substance addictions. Few do it without some kind of outside reinforcement.
But there is room for compassion for those fighting the battle of the bulge and eating disorders too, however, and support groups are invaluable in that fight too.