I recall lighting the dinning room table on fire with one of these. Yet... I too still have all my fingers. Luckily my grandmother was over that day to put out the fire before the house burned. Supervision is a good idea.
At the age of 8, my grandmother gave me a box of matches, some newspaper and told me to play in the garden. Shortly afterwards her shed and fence were well on their way to being no more and I knew how quickly fire spread. Couldn't agree more.