I am debating about switching to tea before work. On days I drink green or black tea instead of coffee, I get less of an "afternoon slump." I also am a bit more "on edge" with coffee, which sometimes might work in my favor (more talkative, more drive at work, etc.), but has it's downsides (sometimes it is better to talk less, and sometimes the energy from coffee is almost too much to focus well). I really enjoy the smell and taste of coffee, however, so maybe I'll do it on weekends or something.