I found a really good link with a list of hazards in your home by category -
101 Feline Home Hazards - Lincoln Avenue Cat Hospital
101 Feline Home Hazards - Lincoln Avenue Cat Hospital
I always thought defuser used a mist not smoke. At least the kind you put a few drops of oil into water and it comes out the top.I would add household vapors and fumes such as incense, essential oil diffusers, and especially secondhand smoke. It's thought that one of the leading causes of oral SCC (squamous cell carcinoma, an aggressive mouth cancer) is from exposure to secondhand smoke. I lost my first cat to oral SCC. She grew up in a household of smokers.Thankfully I don't smoke anymore. I now have several Dyson air purifiers to remove wildfire (and kitchen) smoke because that's a regular summer/autumn thing in California now (the wildfire smoke, not the kitchen smoke.)
I didn't mean to imply that oil diffusers and secondhand smoke are the same thing. Obviously, they are not. Oil diffusers present a different challenge for cats. The oils used in them, many of them are harmful to cats. I did an experiment with my Dyson and it's fancy sensors and found that a Dyson in one room can register the vapors from the diffuser in the other room even in an intermittent vs continuous use.I always thought defuser used a mist not smoke. At least the kind you put a few drops of oil into water and it comes out the top.
I guess it depends on what you put in it, some oils aren't good for people either.
Looks like I will be fact-checking myself for days on this one.I think it depends how you use the diffuser. My mom has one she loves and often has running when I bring Indy and Kabby over to visit, they don't even seem to notice it really. Indy has asthma and it doesn't trigger her or anything.
She only uses 1 or 2 drops though per cup of water. Usually lemongrass or tangerine oils. She gets it from a store that specializes in diffusers and organic oils though, so it's not the cheap synthetic stuff.