Oil-based polyurethane reportedly has some toxicity during application, but it is easier to apply and provides a superior finish compared to water-based polyurethane.
This means that while I may get away with not using a mask while applying a water-based polyurethane, I should never think of applying oil-based polyurethane unless I'm properly (NIOHS) masked. Whether I'm applying one or the other, there should be ample air circulation.
My question is: Does oil-based polyurethane have any toxicity once it has set? If a bedroom remains vacant for one week with the windows open for the week, is there any subsequent risk from inhaling the vapors, especially during long winters when the heating system will just circulate the same air?