My cat found the catnip

He found the unopened bag of catnip on the counter

"What Effects Does Catnip Have On My Cat?
Catnip is a perennial herb from the mint family labiatae.

The term ‘catnip’ is thought to originate from the response cats show towards the plant. It is the nepetalcataria variety that most cats enjoy.

What happens when my cat has catnip?

The active ingredient nepetalactone, is an essential oil which alters the behaviour of domestic and other cat species. Around half to two thirds of cats will respond to this oil. Kittens may not react and only develop the full behavioural change at an older age.

A typical response includes sniffing, chewing, licking, head shaking, followed by chin, cheek, and body rubbing. The body rolling is similar to oestrous patterns and has thought to be an aphrodisiac, but this is unlikely.

Additional responses may include stretching, drooling, jumping, licking, aggression, and hyperactivity. The so called "high" will usually last between five and ten minutes."