15. Mothballs with Naphthalene
For decades, mothballs containing naphthalene were tucked into closets and drawers to ward off insects. However, the fumes from these small spheres are highly toxic, causing respiratory irritation and, in severe cases, poisoning—especially in children and pets who might accidentally ingest them. Today, safer alternatives are available, but the legacy of naphthalene mothballs stands as a stark warning about the dangers of common household chemicals.
