Smoking catnip produces, at most, a very mild sedative effect and a slight sense of relaxation. Some people report a brief, subtle “high” that lasts only a few minutes, but it is nothing like cannabis or other recreational substances. The experience is closer to drinking a weak herbal tea than to any meaningful psychoactive effect.
Why Catnip Affects Cats but Not Humans
The active compound in catnip is nepetalactone, a type of plant chemical that makes up roughly 80% of catnip extracts. In cats, inhaled nepetalactone stimulates the olfactory bulb (the brain’s odor-processing center) and appears to activate opioid reward pathways, which is why cats roll around, rub their faces on it, and generally act euphoric.
Humans don’t have the same response. Scientists suspect this is because people lack the specific receptors that nepetalactone targets in feline brains, though no study has rigorously confirmed this. As one veterinary researcher at Cornell put it, the most reasonable explanation is simply that humans don’t have nepetalactone receptors the way cats do. The two species are wired differently for this particular compound.
This is the opposite of cannabis, which affects both cats and humans because both species have cannabinoid receptors. Nepetalactone and cannabinoids are chemically unrelated, and catnip is not a substitute for marijuana in any meaningful sense.
What People Actually Feel
Anecdotal reports from people who have smoked catnip describe a faint calming sensation, sometimes accompanied by slight drowsiness or a floaty feeling. A few people describe mild headaches. WebMD classifies inhaled catnip as “possibly unsafe,” noting that smoking the dried leaves has been linked with a mild high that could cause impaired judgment, though the evidence behind this warning is thin and based on individual reports rather than controlled studies.
The effects, when they occur at all, tend to fade within 10 to 15 minutes. Many people report feeling nothing whatsoever. If there is a real psychoactive effect, it is so subtle that researchers have never found it worth studying in a clinical trial.
The Real Risk: Smoke Itself
The biggest concern with smoking catnip has nothing to do with nepetalactone. It has to do with inhaling combusted plant material. When you burn any dried leaf and breathe it in, you expose your lungs to smoke particles, reactive oxygen species, and inflammatory compounds. Research on herbal smoking products shows that chronic use causes the same type of airway irritation as tobacco smoke: mucosal damage, inflammation, and over time, increased risk of conditions like emphysema and chronic bronchitis.
Herbal cigarettes, including those made from catnip, also carry risks from contaminants and carcinogenic particles. The fact that a plant is “natural” does not make its smoke safe to inhale. Your lungs react to hot particulate matter the same way regardless of what plant produced it.
Potency Varies by Plant Part
For those curious about the chemistry: not all parts of the catnip plant contain the same amount of nepetalactone. The highest concentrations appear during the floral-bud to partial-flowering stage, peaking at around 1,300 milligrams per 100 grams of plant material in research samples. The leaves alone contain less. Only about 0.001% to 0.3% of the plant contains the essential oil responsible for its effects on cats, which partly explains why the human experience of smoking it is so underwhelming. There simply isn’t much active compound to work with, and what’s there doesn’t target human brain chemistry effectively.
Legal Status
Catnip is legal to buy, grow, and possess everywhere in the United States. It is not a controlled substance and is widely sold as a cat toy product. The FDA does not regulate catnip as a human supplement or drug, though it has taken action against companies marketing catnip-based products with specific health claims (like anxiety relief or pain treatment) because those claims make the product an unapproved drug under federal law.
You can legally smoke catnip, but “legal” and “worth doing” are different questions. The psychoactive effects are negligible for most people, and the respiratory risks of inhaling any kind of smoke are real. If you’re looking for herbal relaxation, brewing catnip as a tea is a more traditional approach, one that has been used in folk medicine for centuries, and it avoids the lung damage entirely.