I don't know if caffeine is good for you or bad for you. But a few years ago, I suddenly realised that I was addicted to it, and suffered from withdrawal symptoms if I went a while without it. I didn't like that.
Yes, I know it's natural. So is heroin. Natural doesn't mean the same as "good for you". Not that I'm saying caffeine is bad, but I just don't like the idea of being addicted to a psychoactive substance. I've never smoked, and these days if I have a pint of beer in a week that's a lot.
So I gave up caffeine, cold turkey. And discovered that, yes indeedy, I was addicted, because I got headaches, and a craving, and it was only after a week or so that I was free from the habit.
Now I mostly drink decaf, although if I swig the occasional caffeinated, I'm not bothered. I'm not religious about this.
But I'm no longer addicted.