I acted with Sci-Fi. They are missing out. If it happens often then it's time to make new friends. Because real friends don't do that. And since they do do they, they aren't worth your time or concern.
Since aspartame was already mentioned ill just add 2 more things
1. It eats away at your tooth enamel (but so does other things of course)
2. That much soda can lead up to bone density, basically brittle bones with holes in them because of all the shits that's in soda period
IMO soda is just...