I switched to diet soda only like 6 months ago but I still drink alot of it!! Like... one 2liter to 2 a day.
How do I kick my habit!?!

And I make that can with my soda stream so it's only half strength diet cola most days. It helps that I'm a coffee drinker, so an extra cup in the morning eliminates withdrawl headaches.
)
so maybe try doing something like that slowly