quadraginta
Becoming Beth
There is other evidence - this concerns the change in the suicide rate in the UK during the period when moving the gas supply from toxic "Town Gas" to non toxic natural gas
http://www.ncbi.nlm.nih.gov/pmc/arti...00022-0018.pdf
I won't copy as this is a 1976 paper, and not sufficiently well scanned for text browsers, although perfectly legible..
On Page 88 (it starts at page 86, don't worry) there is are two key graphs.
In the UK, the main form of suicide used to be using the gas oven which was "town gas " and rich in Carbon monoxide. On the change from that to natural gas, this suicide rate fell for males, but other rates remained roughly the same so the overall suicide rate fell sharply. With Females the rate also fell sharply as this method became unavailable, but there was some compensation with other methods rising.
Looks as if removing easy access to methods of suicide reduce suicide rates.
I think that should read "effective methods". An awful lot of suicide attempts fail because the method chosen is not sufficiently lethal or speedy. (Didn't some celeb's daughter recently try to suicide with some homeopathic cold remedy?)
Guns generally (Yes, I know. Not always.) work pretty well. If nobody is around to stop it, the old 'head in the oven' trick could be pretty effective as well. Both have the advantage of little or no expectation of extended suffering.
Potential suicides who are not firmly committed to their course of action can be deterred by such things when access to a quick and largely painless solution is easily available.
Overdoses frequently fail because the people don't understand what is lethal, and what is not.
I suspect that the ratio of successful to attempted suicides is much higher when a firearm is the method employed.