Suicidal people have a yearning to escape from the pain and stress of their lives. It's not surprising that they would attempt to ease that pain and stress or escape from it by drinking or taking various drugs, including pot. The drug isn't the essential problem, in my opinion, the escapist attitude that leads TO excessive drug use is the essential problem.

That attitude arises out of so many different factors that each case could be considered unique and would have to be dealt with in unique ways. The law can't deal with that. It's not flexible enough or smart enough to deal with that. But people are mentally lazy, so they just make a rigid law saying to everyone "You can't take this drug. If you do, we'll arrest you."

That's just a really dumbass, primitive way to try to deal with a very complex problem, and it's a way that doesn't work. It fails utterly to achieve its stated objective, which is to stop illegal drug use, and I very much doubt it does anything to reduce the incidence of suicide.