Quitting pop was the hardest addiction, thus far. Harder than cigarettes, harder than alcohol.
However, my body - oof, it needed it. Diabetic (alcohol-induced), kidney and liver issues. Pop is straight up poison, and I knew it all the years I drank it, but...seeing the damage it did, in black and white. I was done.
I drank full-steam Coke until the first time I was admitted with kidney issues. Switched to Zero. Drank that until it got even worse.
Now, it is coffee, tea, water only. Black for the first two. If I have a sweet tooth, I throw some protein shake into the coffee.