Why you like it: Coffee helps you prepare for your work day. It smells delicious and it's the perfect thing to drink with donuts, scones, bacon and eggs.

Side effects: According to Erowid, caffeine makes you focus, increases productivity, decreases fatigue, improves performance during menial and boring tasks, increases gastronomic reflexes (keeps you regular), and increases the production of stomach acid and urine.

Verdict: Coffee really isn't all that bad for you, especially when used in moderation. It can turn addicts into raging lunatics, but it can also help prepare you to put out fires in the work place.