As someone who sporadically quits coffee throughout the year, the only differences I've noticed is that I feel the same without caffeine. I don't feel magically any better or worse. I just feel the same as if caffeine wasn't a factor. So I go back to drinking coffee and tea because I enjoy it. But I also hold that bit knowing I can always quit because I have done it. It's not addictive in the sense of cigarettes. It's a pleasurable taste. Caffeine has a side effect that has marginally minimal negative effects. So I don't get why we criticize outselves for enjoying something such as beverages with caffeine.