I'd say people leaving their car running in the garage trying to warm the car or whatever and a running fireplace and both cases spreads carbon dioxide throughout the house which can lead to death if its too much or you already have a weak respiratory system.
Most deaths during tornadoes are from flying debris.
Most deaths during a tornado are caused by debris.
football
Deer
Most deaths and injuries in a tornado are the result of flying debris.
Aftershocks cause the most earthquake-related deaths and injuries.
Most deaths in a tornado are from being struck by flying or falling debris.
Aftershocks cause the most earthquake-related deaths and injuries.
The one that causes the most deaths and damage
Most deaths from rabies in the United States result from bat bites
disease epidemics
depression