i agree that soda is not good for you, but i'm not sure about it being a poison. you're not inhaling it, you drinking it right into your stomach, and it stays as a gas. i think any gas that you drink is either gonna just make you a little bloated, or make you burp. i don't see how it's gonna affect you in any other way.
ugh. everyone always wants to disagree. it makes your body too acidic, all that acid you're ingesting. the water flushes it out.