I was a total caffeine addict for many, many years. My caffeine of choice was Coke Zero. I can't remember when it started, but it must have been in 2007? I've tried to quit several times and many times I managed to stay away for several months, but the craving was always there beneath the surface, which caused me to relapse several times. I only managed to give it up for good only just last month, and that's because I figured how to actually kill the craving as opposed to just ignore it. I realized that the reason I was addicted to caffeine is because I was tired all the time because I had what I realize now is bad eating habit, meaning that I have a tendency to eat too little real food and tend to leave long intervals between meal. It's a relic from my days when I was deathly scared of eating for fear of gaining weight. Then I would be so tired, really, really thought about it and felt 'low' and have very low energy and motivation to do anything, and I needed a 'kick' and that feeling of excitement, and of course I'd reach for Coke Zero and sometimes sources of BOTH caffeine and sugar like bubble tea, iced teas and coffee and sometimes chocolate. Several months leading up quitting this time i have already greatly tapered off my coke zero consumption and came to this realization that if I really want to kick the habit for good, I had replace it with something so I started eating regular meals and more fruit, and because I was used to going 10-16 hours without food I had such a low appetite so I had to make myself eat even when I wasn't hungry...and what do I know I start having real energy again and I can actually cycle for a lot longer without having to force myself to, I'm losing weight without much effort, my appetite returned, I start to sweat and feel hot again and my skin is so much better now!