Worst-case Future Blueprinting Technique
Creating a nightmare scenario allows you to anticipate the emotional discomfort the final result, of continuing your bad habits, would bring. (At least to a certain extent and depending on your depth of imagination.)
Transferring the repulse of the ultimate outcome to the habits creates a deterring effect to help you prevent your worst-case scenario instead of fighting your way out once you get there.
Having both an ideal and a nightmare vision, you are adding a subtle compass to your everyday behavior, avoiding ending up somewhere you don’t want to be, by default.