Catnip Herb can cause central nervous system damage in cats?

[astro]

Any validity to this bold assertion?

Catnip Herb can cause central nervous system damage in cats.

[Q.E.D]

Well, according to several veterinarians, such as this one, no:

My cat really goes crazy over catnip, is it dangerous?
Cats are unique in their response to Catnip, and the response can be very dramatic in some cats - rolling, licking, rubbing, drooling, jumping, running. Other cats appear to become very sedate after exposure. And, as mentioned above, up to 30% of the cat population does not respond at all to catnip. In any case, for all of the (sometimes entertaining) behaviors seen, Catnip is completely nontoxic to cats. If a large quantity of fresh Catnip is consumed, you may see some vomiting or diarrhea, but this is rare and self-limiting. If your cat experiences this, limit or withhold Catnip.

Emphasis mine