This is my take on all of this. Spitting cobras would be considered venomous and poisonous. IMO venom is a Biological toxin injected into the body and/or bloodstream by an animal. Poisons can be put into the body in any form. Its not venom just because its injected into the body. If that was the case heroin would be considered a venom when its injected. As for the eating dabate. It would be considered a Poisson if you were to eat a venom gland. There are several things to consider when classifying something. Like route into the body, chemical make up (synthetic or Biological) ect. Also I may be wrong but isnt it only the skin/mucus membrane on a dart frog is poisonous?