Weirdest Productivity Hack I Found For Myself Lol

I have for so long struggled with discipline and self control, I tried every method I saw online until while I was at work I made up this method. It's literally just saying for example  I'm The Type Of Person when I crave hot chips I buy a water. And for some reason this is the only thing that has stopped me from buying hot chips, which I was very much addicted too. I just kept repeating it, and i haven't even stepped in the store cause it worked so well. I've been using this for my nail biting too, Like i'm the type of person who when I feel the urge to bite my nails I clench my fist. No idea why this works but yay I guess. I think it's maybe something to do with taking away the decision, if I say I will only eat a small bag of hot chips. I can negotiate with myself, but saying I buy water the decision has already been made.