– Catnip does get cats “high,” but it may be more of a sexual / pheremone reaction than a chemical high like that found in humans using marijuana.

– It has different effects depending on whether it is consumed or inhaled, and even cats with no sense of smell can be affected.

– Humans have used catnip (usually in teas) as a mild sedative and to relieve joint pain.

Scientific American (source)

(The video speaks the truth, and seems to have gotten many of its facts from cat-world.com.au)