Hey Pepsi :-)

Those drinks are still full of caffeine so it's probably that which is causing your feeling of addition.

You don't seem to be drinking too much of it, but if you want to stop then why not try slowing down at first, maybe just two can per day at the most, and then a few weeks later just one and so on.

If you stop all at once, it might give you headaches, but you could try!

Hope you give it a shot
DG