Why would you leave the toxic plants in places the cat chew on them, though? Or if you can't keep them out, why have the toxic plants? I mean, I have a mint plant that can irritate them, but between it being inconvenient and the cats having very convenient and safe plants of their own to chew on, it is no issue.
And as a sidenote: It is always best to look up every plant you want to bring around your cat - at least a few, you might consider not having. Easter lilies, for example, have pollen that is toxic to cats. They don't have to eat it for it to kill them.
I'm not arguing with this, though you can end up in a situation where you get a cat after having a plant for a long time, or someone not aware offers you a plant, and depending on your house or apartment, it's often not easy to find a place for your plant that your cat can't reach.
And yes, you should look up your plants for cat toxicity and the solution is often to give your plant to someone else…
That's an interesting point; I think it depends on the situation though. Especially houseplants could pose a risk here, in which case it's probably easier to just not get them, but oustide the situation seems to be different; I have the impression that when there's a decent amount of plants cats don't go for the toxic ones. Purely anecdotal but having lived on the countryside for decades with tens of cats and about 50 species of vegetation which are confirmed toxic to cats I have never seen a problem. Nor have people I know.
I have two cats, and they show good judgment on what plants they nibble on. They only show interests in the grass that I grow for them (in general any kind of grains, e.g. wheat, barley, etc.), and they never touched my other house plants. This is anecdotal, but at least in the case of my two cats, they seemed able to distinguish edible grass from toxic ones with no prior learning.
And yes, they want to eat those plants anyway. And they are often stubborn with this.