It is still 5 days of a successful diet. Now you just go on and on. Nothing bad about failing here or there. It happens and it will happen again. What's important is to try again, and not give up.
What you said about smoking is quite interesting. What's more - smoking would numb your sense of taste, and because of that - smokers would choose a stronger spaced food and very sweet carbonated drinks. Just to feel something. Make sense, right?
Changing any bad routines takes time. Try new things so long as you find something that works for you. For me, it was a combination of intermittent fasting and keto. And before that - I was constantly hungry and hated myself for it.
I cross my fingers for your strong will and patience. You will get there!