do cell phones cause explosions at gas stations?

The gas stations in my area have recently begun posting signs that not only must the ignition be off, but all cell phones must be off also. This is obviously because of a fear that the electronics might ignite the fuel fumes. I am pretty sure that I saw Cecil talk about this recently, and his conclusion was something like, “Yeah, it is possible. But a lit cigarette is an even bigger danger, and that never happens either.” But I cannot find this column. Does it sound familiar to anyone else?

advTHANKSance