system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do cats love Cat-Nip so much and what exactly does it do with them?
gpt
When they scratch and nibble on it it releases a chemical known as nepetalactone.

If they inhale it, it's a simulator but if they eat it it's a sedative. 

Just like people and drugs/alcohol, different cats have different reactions.