It's a strong addiction. I'm a device for turning diet code into working software ;) [1]. I need the caffeine kick. I don't particularly like to drink tea or coffee (which wouldn't help with the teeth coloring anyway). And I like the taste of diet coke (or coke zero) a lot. I tried switching to water multiple times, but was unable to sustain it. I wish Coca-Cola would produce a colorless variant (like Pepsi once did), which would at least improve the whiteness.