Is tobbaco Kitniyos?
I can't see why the tobacco plant itself should be kitniyos. It's nowhere on this list; I'm unaware of any grain, semigrain, legume, or the like that can be made from the tobacco plant; and tobacco's closest edible cousins (botanically speaking) are potatoes, tomatoes, peppers, and eggplants -- all of which are generally eaten on Pesach.
I have no clue how tobacco is processed, flavored, modified, etc. before it makes its way into tobacco products, though. But I can see no reason why the plant itself should be kitniyos.