I think the word “addiction” is being used inappropriately here. I seriously doubt that the brain is being remodeled in such a way as to make smelling babies an overriding imperative that causes one to ignore everything else to the point of dying.
Many things activate the reward centers of the brain without being addictive.
"Addictive" means that when you stop the food, smell or activity you get SICK, like a heroin addict who stops his heroin cold turkey.
"Habit forming" would be the correct terminology. Smoking is habit forming. When you stop it you don't get sick...you stop coughing.