If the stove has an open flame, he will start lighting his fags off it. We've all been there, desperate and without a lighter, but only the bottom feeders of society make it a regular habit. "I dont need to buy a lighter, I've got the stove".
He'll presumably then run from the kitchen to bedroom 2, lit cigarette in hand, lest anyone find out he's been smoking somewhere other than the designated room. There's no chance that he remembers to turn the hob off every single time.
On a long enough time-frame, the chance of a serious fire incident approaches 1.