It's just too easy to fall asleep! They fall asleep, the cigarette falls from their fingers, the bedclothes start burning, and they never wake up because the fumes kill them!

They can easily overbalance as they burn down, land on a carpet or newspaper, and start a fire. A smoker should never leave a cigarette burning down on the edge of a table or shelf.

They should also make sure the ashtray is heavy, can't tip over easily, and is made of a material that won't burn.