Very good no one was hurt and that it was contained quickly.
I smoke, and I am very particular about disposal of butts and extinguishing-this being the reason. My dad taught me to "field-strip" butts, mashing the hot parts out with your fingers then spreading the loose tobacco so that it won't keep burning- then pocket the butt and paper.
Glad it was insured and your steam items and most importantly family and pets weren't in danger.