You're all going to work in offices some day, doing important stuff that requires concentration...and guess what? IT'S NOT GOING TO BE DEAD SILENT. PEOPLE ARE GOING TO TALK, CHIPS ARE GOING TO BE EATEN, and PHONES ARE GOING TO RING.
Some of us already work in professional offices, where there are in fact policies and guidelines on what type of food may be stored/eaten in one's work area for the very purpose of protecting innocent co-workers from smells and sounds which are distracting and/or offensive. Also in these professional work environments companies implement these creative solutions called coffee bars, and breakrooms, where people can let the smell of their brats and sauerkraut waft around to their hearts content, because this is a designated eating area.
The professional work environment is not like the movies where everyone sits at their desk with their feet up eating chinese food, or munching on trail mix. Law school libraries (at least the floors explicitly designated SILENT) should not be either.
Or, even better, learn to tune out distractions and stop being an easily distracted 5 year-old
The sound of someone chewing, swallowing, cleaning their teeth with their tongue, etc. is far more than distracting. A random cell phone ring, or someone with a chronic cough, or faint music coming from across the room is distracting, but I can deal with those things. The amplified sound of the inner workings of one's mouth, throat, and digestive system in an otherwise silent environment is offensive. I like to eat something from time to time when I am studying all day, and I appreciate the opportunity to get up, stretch, walk out of the library, and chew freely in the lounge.