Flat Cigarette Packs

I do not smoke, but still when I see people with a cigarette box with only 4 or so in it, it makes me wonder why it's worth carrying around such a thick box for such a small amount.

My idea is a cross between those metal cigarette packs and the stride packs of stride gum. Clearly there are less pieces of gum in a box than there are cigarettes, but its the same concept- Use half of the box, and tear off the now excess waste.

Unlike the gum, the cigarettes would have to lie horizontally. The box could fold just as that one does. So if you have a pack of 20, after you have smoked half of them, you have half the thickness of a box that can easily fit in a pocket without the added bulk.