Caffeine is very accepted in western culture. But that does not mean it is good for you.

When I was working my corporate sales job, I was a slave to caffeine. I used to down several large cups of coffee every day. I thought it helped me. After noticing some of the side affects (trouble sleeping, tension in back, unable to focus without caffeine) I decided to quit coffee cold turkey. While I did reintroduce tea into my diet, I have not had a cup of coffee in 7 months. I have been sleeping better, my concentration and creativity increased and my mornings are enjoyable.