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I'm currently switching to Mate, love the taste and the Bombilla thingie :D Check it out if, might be of your interest as well.

Thanks for suggestion, I will definitely try it out.

I also drink green tea, but I thing coffee makes more effect, when I have to stay up all night studying coffee is my only solution!

I'm a coffee lover, but also be careful with teas, I might write a post about that sometime.