The great cigarette debate?

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I don't mind going to get the food-shopping. It doesn't stress me too much. But what drives me nuts is when my wife waits until I get home (about 3 times a week) then says "oh, can you buy me some cigarettes?" "What!!!!!" I say, "I've just been to the shops" (car drive away). Why, why, why? This stresses me out. Why doesn't she ask me before I go? Why doesn't she call me when I'm there? She says she forgot. I hate cigarettes anyway, I don't want to buy them. Is she sending my blood-pressure sky-rocketing on purpose or am I being unreasonable?