Caffeine is awesome. Well, coffee is awesome. Caffeine is kind of a bummer, actually. Because it’s so damn addictive. It’s so chemically addictive, in fact, it changes the chemical makeup of our brain. It actually blocks a hormone in your noggin called adenosine, which makes us feel tired. Eighty percent of us Americans use caffeine to get by. Every single day. But coming off it can make you feel nauseated with flu-like symptoms, give us headaches, and sometimes even give us the shakes if we don’t get our fix. Sounds more like crack or coke, right?