The are many toxic substances that will kill you eventually but it doesn't mean they are peaceful, in Africa there go to toxic substance for suicides is sniper insecticide there are hundreds of cases but if you want your last moments on earth to be in excruciating pain that's your method, it burns through all your vital organs they scream in PAIN until they shit themselves and eventually die, worse thing, if you did survive an attempt, you would be fu@ked.
Don't think PN and the PPH will be publishing reports on it, Please do not attempt any of these painful methods.
Cheers
Geo