My understanding is that SN usually fails because the person was found too early and saved, or they threw up and nothing got absorbed. Aside from being rescued, I'm pretty sure the biggest cause of failure is throwing up and nothing getting absorbed. While it's true that it might only take 1g to kill a person, that won't matter if your body doesn't actually absorb any of it. It doesn't help that a lot of people who take SN don't use an antiemetic either, and my understanding is that SN is very easy for the body to just throw all up. My assumption is that the high success rate of SN only refers to when the full protocol is followed, not just taking SN on an empty stomach and hoping for the best. I wonder if the SN success rate is actually inflated because of this.
My method is going to be SN, but I have no access to antiemetics and I throw up easily so honestly I have little confidence in succeeding. I'm considering backup methods.