ADHD, self-medicating behaviour from childhood in the form of candy seeking. Impossible impulse to control and occurs when experiencing a dip in concentration/boredom. It helped me focus for very brief moments.
Ooooh man as a kid I didn't really like stuff that was strongly sweet or sour. But as an adult sour candy were my thing to the point that I burnt out them even tasting sour. I'd eat a family size bag of sour Skittles on long drives to help me concentrate.