While eating snack cakes I can operate a motor vehicle or other heavy machinery without endangering myself or anyone else. I can do higher math, read a novel, read a newspaper, meaningfully participate in a discussion on any topic, build a dynamic financial model, do my taxes, do your taxes, pick a stock, write a grammatically correct post on this site (which seems to be getting dumber with each passing day), and (most importantly) I can sit at my desk and do my job.
While you are high, you can gorge yourself on pizza and nachos, watch the Cartoon Network and laugh/drool over the "Cow & Chicken" marathon, and if you're really creative come up with inane business ideas.
All things considered, I'd rather take my chances with Little Debbie.