ya I tend to take the poisonous plants thing with a grain of salt since the data is more for cats and dogs.
you know way more about plants then I do. I believe they are considered toxic because they are in the nightshade family? I could be way wrong on this.
No, nightshade is defiantly 100% poison, do not use nightshade. Nightshade produces harmful alkaloids, as well as Nicotine. All Nightshade produces both, Nicotine even is found in Tomatoes, and Egg Plants. A single Drop, of pure concentrated nicotine will stop a humans heart in minutes, dont even need to be consumed, it can soak into the skin and cause your heart to stop.
The fear from Pothos is Oxaltes, which are a calcium blocker. Ivy has something else going on, some kind of irritant, that can cause itching in humans and upset stomach in animals.
However, as you said, that is based on Cats and Dogs, I have always heard that Birds are the best closest to reptiles in matters such as these. Birds have no toxic reaction to Ivy. I still dont trust that, however lots of folks, feed their stick insects straight English Ivy, and feed those to their chams with no ill effects. So I think its probably fine to have Ivy, as long as the Chameleon in question isn't going to munch it down. If you notice a skin irritation issue, where the cham avoids touching the ivy, or going near it, then remove it.
