Point of Parliamentary Procedure, Lileks:

James Lileks is not happy with the soda ban in NYC.  He's also a little irritable about people who refer to sodas as "poison."  He has a few examples of the difference between things like d-CON and things like Coca-Cola, and then adds:

Oh but she has a six ounce glass bottle, and now we have redonkulous sizes! Yes. That's true. And I apologize for reviving the word Redonkulous. But if soda is poison, then portion size is irrelevant. The Mr Yuk stickers don’t say “call 911 but only if you drank a lot of bleach. A little is okey-doke, though." So it's not a poison unless you drink huge amounts all the time, which is also true of shampoo and vodka and sugary lemonade little kids sell at card tables on the corner in summer, and motor oil. Right? So it's not poison.

Actually, the way d-CON works is through an anticoagulant that my grandmother used to take by prescription for her heart condition.  Also, a little chlorine bleach -- two drops per quart of water according to this government-issued pamphlet -- is a useful disinfectant for drinking water in many situations.

The distinction between "poison" and "not poison" is actually pretty hard to draw.  Plain water can kill you if you drink too much of it.