> Suicide in the United Kingdom declined after coal stoves were phased out, removing a means of suicide by carbon monoxide that had been available in many homes. Tylenol (or acetaminophen) overdoses in England and Wales fell by 43 percent after legislation passed requiring that the medication be sold in “blister packs” where you have to pop out each individual pill; that simple switch from big bottles was enough to save lives. When the Israeli Defense Forces stopped letting soldiers bring their guns home over the weekend, suicides fell 40 percent, primarily due to a drop in firearm suicides committed on weekends.
https://www.vox.com/future-perfect/2018/11/15/18095174/pesti...
And if someone does decide to try to kill themselves, guns are more likely to be fatal:
> About 85 percent of suicide attempts with a firearm end in death. (Drug overdose, the most widely used method in suicide attempts, is fatal in less than 3 percent of cases.) Moreover, guns are an irreversible solution to what is often a passing crisis. Suicidal individuals who take pills or inhale car exhaust or use razors have time to reconsider their actions or summon help. With a firearm, once the trigger is pulled, there’s no turning back.
https://www.hsph.harvard.edu/magazine/magazine_article/guns-...