"According to the United States National Toxicology Program, the inhalation exposure toxicity rate of of ethyl cyanoacrylate, or super glue, is safe and additional study is unnecessary. The report also highlighted an extremely large LD50, with over 5000 milligrams per kilogram of body weight required for a lethal dose".
So it's only very mildly toxic, like a lot of other household products. Well ventilated space yes, but inhaling it won't kill you. There simply isn't enough heptane (the accelerant and the main irritant present) in a bottle of CA to do that. It's on a par with acetone - nail polish remover. No need to take risks, but no need to avoid using it as long as you behave sensibly around it.