Well with SN there is the time... up to 20 minutes of knowing you are dying before you pass out... I think a lot of people really struggle with SI and Anxiety during that time and would call for help. No matter how committed a person thinks they are 20 minutes is a long time for survival instinct to completely take over. You can even see a few seconds of that SI in N videos. A few seconds , no problem, but 20 minutes... that is a lot of time for your mind to work against your plan.
Other cons as I see it are :
While there has been a lot of research in this recently, there is still a lot of unknowns. It seems with some people to much or to little can cause complications.
Some people throw up with pre-meds others succeed without them. Even when reading literature on the method the dosing has changed significantly over the years across many sources. If you do vomit you are either going to redose , wait and see what happens, or call for help If for any reason you do not succeed , you may or may not fully recover from it depending on how much SN is in your system and how quickly you are found. Most cases I have read on this site of survivors say they recovered fully or close.
discoloring of the body may be a disturbing sight for who ever finds the body
But the one that concerns me the most is that it effects the transport of both O2 and CO 2. It's the CO 2 that concerns me. How does it effect the transport of it? Because if your body is unable to expel CO 2 you would have the feeling of suffocation.
There are survivor stories on here , I havent seen anyone say they felt like they were suffocating. But still that is a concern for me, because SN has a different effect on each person, and we can not ask those who died from this method how peaceful it was.
I was really against this method when i first heard of it, now I think its probably pretty reliable if done correctly. With other methods there is a very common dose and pre med dose, and time frame as well as a complete understanding of how it works and how it feels. With SN no one can factor in the individual , and with SN it really seems to vary from person to person.
Even though I was skeptical at first, I have my SN kit tucked away just in case. If a person is truly committed to the method and prepared for unexpected side effects or vomiting I am pretty sure its success rate is close to certain.
Finaly, we can only take the word of those people who claim to have attempted and failed. We are putting our trust in a person we have never met who may be fabricating it all for either sadistic or pro-life intentions.