Through meditation, people have learned to exhibit some amazing control over things that were thought to be entirely outside of conscious control. Perhaps the best example of this is Wim Hof: http://en.wikipedia.org/wiki/Wim_Hof
That man can spend nearly two hours sitting nearly naked immersed (except for his head) in an ice bath, without his core temperature dropping to dangerous levels and without suffering frostbite. He has also done such insane things as run a marathon in a desert without water.
It certainly seems plausible to me that there are probably many more things that we currently think are not consciously controllable this way that will turn out to be. It would not at all be surprising if one or more of those turn out to be things that you could use to kill yourself.
That man can spend nearly two hours sitting nearly naked immersed (except for his head) in an ice bath, without his core temperature dropping to dangerous levels and without suffering frostbite. He has also done such insane things as run a marathon in a desert without water.
Here's the pubmed link to a paper by some researchers who studied Hof to see what the hell was going on: http://www.ncbi.nlm.nih.gov/pubmed/22685240
It certainly seems plausible to me that there are probably many more things that we currently think are not consciously controllable this way that will turn out to be. It would not at all be surprising if one or more of those turn out to be things that you could use to kill yourself.