Someone I knew developed psychosis and eventually committed suicide. I'm not close enough to know the full diagnosis but my understanding was that they the psychosis was brought on by drug abuse, possibly "2cb" but who knows what you're really consuming in random pills...

A friend once pointed out that much discussion around drugs is completely polarised. Either drugs are evil and we must root it from the face of this earth or cannabis and psilocybin are wonder cures that fix everything from back pain and anxiety to IBS and writers block.