I have an exit bag I'm using to ctb, and I need to test it. The moment I feel dizzy and like I'm about to pass out, that bag is coming off my head. Yet, I'm extremely nervous about that, because passing out is a slippery slope, you're not always in full control of yourself. So instead I'm just using an oximeter to test the gas purity.
Anyways my point is, I would not be able guarantee that you'd have enough coordination while feeling that faint in order to huff the deodorant and then fall into the noose, it's less simple than it seems.