The acidic effects of Coca Cola?

Alright so I know the acid in Coca Cola and other pop drinks wears away the enamel on your teeth. I'm addicted to diet coke and so I always use a straw to try to prevent dental erosion but then I began to think if the acid is that strong could it eventually cause an ulcer or gastric rupture? It seems drastic but does any one know? Ps. I know it's not a healthy habit b/c of the chemicals and I know carbonated water isn't great but that's not what I'm asking so please don't put that in your answer, thanks.