One of the classic reasons for a home fire is smoking cigarettes in bed. It is a bad habit that might have lethal consequences. Indeed, if someone falls asleep while smoking, the cigarette, still burning, could as well fall on flammable materials, like blankets, carpets or clothes. The consequence in this case are serious, as it is obviusly less likely that someone who is sleeping acts on time. Not only that, he could run the risk to be dazed by the smoke while still sleeping, and not even notive the fire. Throwing cigarette butts in the dustbin could be dangerous as well, there might be paper or other flammable materials, and sometimes cigarette butts are hot enough to start a fire, even if we are sure they are put out. For the same reason it is not advisable to empty the ashtray in the dustbin.