I don't drink coffee or tea, and I never really buy energy drinks.
Lucozade is my most common energy drink purchase, and it's obviously a very different sort of energy drink, compared to the likes of Relentless or Red Bull.
I don't have much caffeine at uni, really, mainly because I have to buy it, lol.
At home I'll have more, because I'll drink cans of Coke/Pepsi and the like, when my parents buy it.
I replace that with Carbonated Flavoured Water at Uni, which doesn't have caffeine, or even much sugar.
I'm kinda glad I'm not big on Coffee and the likes though. My mum needs at least 5 or 6 cups of coffee a day, usually. And my younger brother is just as bad, but replaces his with Coke, which is surely worse for him.
So, while it's not the worse addiction, I'm kinda happy that I'm not addicted in anyway to Caffeine.