The only fear I have is from Asian import cat toys with catnip in them. They are required to be fumigated when brought into North America or Europe so there is some residual pesticide in the toy. I usually buy catnip toys at cat shows that are made locally or buy the loose catnip to be safe. Every cat has a different reaction to catnip. Some get totally goofy and some can take it or leave it. I have had all types over the years.