My male cat, Howard, most DEFINITELY has the catnip gene. lol. He loves it fresh, dried, stale, mixed with his food (Once, when we weren't home, he got ahold of the bag I keep in the cuboard and ate the whole thing--and tripped for three days!) Howard loves catnip so much that I'm half convinced that he was a farm cat at the Woodstock site in one of his former lives.

This is your kitty on catnip

Catnip Joint (funny)

Kitty in the Sky with Catnip

Luna...not so much. When I give Howard some, she just sniffs and walks away. The only time she freaked out was when it was fresh catnip...and I don't think she liked it much. She laid down, rolled on her side, and cried. So no more catnip for Luna.