What Was Cheney Chewing During State of the Union?

I missed the POTUS’s SOTUS last night, but a couple of friends have said that just behind him Cheney was not-so-surreptitiously putting something in his mouth and chewing and washing it down. Antacids was one guess, crackers another. So on top of everything else—rude.

What Was Cheney Chewing During State of the Union?