Felines are wonderful creatures to have around the house — but they also have a habit of eating and licking things that do not belong to them. My own cat has decided that the elephant foot plant in our living room is her personal snack; luckily, we checked before buying that it's non-toxic for cats, or else we'd be in trouble. But there are many things that are toxic to cats lurking around your house, and some aren't obvious unless you do a bit of research.
Having a pet is much like having a kid: you have to check the contents of everything, because they will get everywhere and eat everything they're not supposed to. Cats don't confine themselves to the cat food and toys that have been created specifically for them; I've heard stories of cats who've eaten everything from the Sunday roast to an entire packet of biscuits (at the bottom of a zipped-up backpack, no less). If in doubt, consult your vet or an expert service like the Pet Poison Helpline, which has a huge directory of possible toxins that could affect your precious Fluffy. Lock things away, and don't believe that just because something looks inaccessible, a cat can't get to it.