More than likely the dog is ill , or has swallowed something blocking the digestive tract, take it to a veterinarian as soon as possible.
You should pick up the other dog poo so the other dog can stop eating it
Hunger
Feed it.
tell it to stop it and wack it
Keep the diapers in a location that the dog can't get at.
Definitely take it to the vet. The cigarettes could kill the dog.
The show Dog Whisperer had an episode about a dog who had an obsession with eating rocks. That will give you an idea of what to do.
kill it.
Go to pet store or tractor supply.They have pills out to stop your pet from doing this.
try too pull
Get the dog some good chew toys. Dogs need to chew.
Let him eat large animals.