[Vaduz]

WARNING

Some of the chemicals in mothballs can cause reversible health effects that include headaches, nausea, eye and nose irritation and coughing. Exposure to naphthalene can cause more serious effects, including hemolytic anemia. Naphthalene is also a possible carcinogen.

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You could post the Safety Data Sheets for a variety of toxic substances found in the typical household, the key is using it as intended by the manufacturer. I notice all the anecdotal stories above where month balls didn't quite work as intended or had some adverse property was because people weren't using them to kill moth larvae in stored clothes. If you use oven cleaner to rinse off your contact lenses you're going to have problems. Read the effing label folks.