Green tea has very little caffeine in it; less than black tea, which still doesn't have that much. This is just an estimate, but the caffeine in three cups of green tea is probably not much more than the caffeine in one can of coca-cola, which is still less than half of an average cup of coffee. So you're probably just fine with your current green tea regimen.
That said, it probably couldn't hurt to abstain completely. I recently abstained myself because during the academic year I had been consuming about half a gram of caffeine (approx. 5 cups of coffee) per day and I figured that I should give my body a break during the slower summer months. I quit cold turkey and it was surprisingly easy. I think it would be especially easy for you: just switch to decaffeinated tea. Half of addiction (assuming you're addicted, which you may not be) is the behavioral patterns involved, so continuing the ritual of drinking green tea should make it completely manageable.
As far as health benefits or detriments, studies routinely indicate that caffeine use in moderation is not only harmful but may have some health benefits. However, there is certainly a downside once you become addicted. When caffeine addicts use caffeine, they don't actually experience a boost like ordinary users; they are perpetually in caffeine withdrawal, and using caffeine simply brings them back up to "baseline," the state they would otherwise be in if they simply didn't use. So you should judge for yourself how dependent on caffeine you are and choose accordingly. I suspect that if you made this thread, you are probably at least somewhat dependent. Even small amounts of caffeine, if taken daily for extended periods of time, can foster addiction. My dad is completely addicted to the caffeine in soda, which really isn't that much caffeine... but that fact doesn't make the headaches go away.
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