How bad is only drinking soda?

Been drinking exclusively (give or take) no-sugar caffeinated sodas since a child. Not obese or diabetic. Mid-thirties now. How bad is this?

Not the answer to your question but: Have you tried water? It’s really not that bad. Some even like it.

As for your question: Mayo clinic says “It’s not known if drinking diet soda every day is harmful. The evidence on diet soda’s health effects isn’t clear”. So no one knows, but I thank you for your contribution to this experiment. Hope it works out well.