Incense. Though it's a popular way to add a pleasant scent and feeling of zen to many homes, incense combines many of the worst qualities when it comes to harm for cats. Cats can be extremely sensitive to smoke, which is a major factor in worsening, and perhaps even causing, cat asthma and other respiratory conditions.

Do incense sticks affect cats?

Even though incense can be relaxing for us, it is not safe for cats. Cats are very sensitive to smoke. Burning incense in the home could cause your cat to have upper respiratory symptoms, such as sneezing, congestion, and watery eyes. ... Burning incense could also trigger asthma to develop in your cat.

What smell does cats hate the most?