On another note, I'm not sure if hash is hashish (I don't think it is) but ive had hash oil many times and what happened it it got me super high. I didn't notice any bad properties to it besides I wanted to sleep and that I did for a while after smoking some of it on greenery.
I am sure hash is just a slang term for hashish, not sure about bad properties, I guess it all depends on how it is made, I remember the old "SoapBar" or "Slate" used to be terrible quality, but these days I think its all highgrade bubble hash its pure THC squashed in a block.