Are bad eating habits harder to break than other habits, like smoking, etc.?

I was at the grocery store and I passed an obese woman on 3 different occasions. Each time she was eating.

Eventually she was in the checkout line next to me, and slightly in front, and she ate the entire time she was in line. I’m assuming she had some chips or something that she would still pay for, but I don’t know because I didn’t look that close.

I would think it might be harder than quitting smoking or drinking because with those habits you quit altogether. Obviously no one can quit eating altogether.

If that woman had denied herself those chips, forced herself to go through the store without eating, would she have felt the same anxiety a person feels when they’ve quit smoking? And if she kept doing it, kept at it, would that anxiety lessen like it does with other habits?