Well actually the diet soda was an addiction in some ways for me whether the caffeine or the Aspartame
I really don't know. It may have been habit forming, however I am happy to report that I am finally not drinking it and I only drink water now.
Cigarettes are not good for people but they smoke it and so are a lot of other things. Some healthy people that have never been overweight a day in their life may ask some of us, "Why the Heck are you people so fat??? Is food addictive or something??? So I don't question people's addictions, I just try to support their resolve at quitting.
So I didn't think diet sodas was healthy but like food, I enjoyed them immensely! But now I'm over it!