My cat enjoys catnip, but I have to be careful after she eats some – she gets excited and wants to play, but she forgets her usual "care and attention" with her claws, and can be a bit "scratchy". Not deliberately – she just forgets she's got razor-sharp needles attached to every limb.
It's probably worth extending the study to explore cat behaviour, to cover all bases/risks/eventualities.
Also: repels mosquitoes and attracts cats? TAKE MY MONEY! I'd choose this over Deet any day!