coffee, old soda, and caffeine

Coffee might kill you! It all depends on whether you metabolize caffeine quickly or slowly. If you're fast, it reduces your risk of a heart attack. If you're slow, it increases it, but the study only included people who'd had non-fatal heart attacks, so heaven only knows what could happen to you.

And speaking of caffeine, Tab cola doesn't have as much caffeine as coffee, but there are people who manage to drink eight cans of it in a day. I can only assume their tolerance for aspartame and saccharin (and potentially benzene) is pretty good and that they metabolize caffeine quickly. It could just be that they're in the media or the entertainment industry and are from Mars, but what do I know? I studied low temperature physics, not rocket science.