Sorry but its hard to tell. Where in the world you are might help people. Wait for it to flower may help too but id google if you havnt already.
I can't help but thinking How many peoe are gonna touch the damned thing and get a rash before they know not to touch it? Its not an answer to your question but a solution to the problem haha
If everybody you know that touches it gets a rash, haven't you already answered the "is it toxic" question?