One liter of tea seems too much. If you drink it quick enough you will surely feel "high".
When I was in Morocco I developed this addiction to green tea, and after downing a full teapot, a big one, maybe around 3/4 liter in one hour in the afternoon I had problems to get my sleep (which usually comes to me fast and heavey) and was overexcited
I mean, it's an excitant. one liter? also depends on the concentration I guess, if you do it very light it's not the same as if you do it very concentrated.
As for antioxidants... I wouldn't go as far as to take any pill. But a pomegranate, why not? A couple tea cups, why not?
I heard this story also, how old men from the sahara were so addicted they cried from pleasure when drinking their tea...
can be addictive, for sure.
edit. btw, hello! I´m gaurwraith, I´m usually up there in the language and linguistic forum, or a bit down in the fit club, running 10.000 miles...
I am a lvl 89 sword barb