Reason to cut caffeine

[sam123]

I drink way too much coffee (Italian mocha machine) and have been looking for a proven health reason to cut back. If I find a reason I will have no problem cutting back. If I dont find a reason, I will not cut back - I like to too much.
The only definite reason I have found to cut back is that it causes bad breath - which I hope i don't have-. People talk about heart risks, but the doc says my heart is very good. Does anyone know a real long term side-effect of too much coffee/caffeine?