It's hard to know unless you try it, but from what I know, it's complicated; it's not easy. What's true is that, even if you think it's a dumb question (I don't think it is), methods like these naturally cause unpleasant effects, such as vomiting and dizziness. I don't know to what degree, but I read about it a while ago, and I imagine it must be unpleasant and annoying.