Substitution effect--far too many drugs, cheap alternatives such as plastic bags, razors, etc. exist. Japan makes it almost impossible for folks to have firearms but has a very high suicide rate that last time that I checked. Once again the tool is not the deed as far too many magical thinkers believe. A gun is an inanimate tool, no more no less, and the person acts on it rather than the reverse until at least Googul Nest folks start making smart internet guns.