No they had no mental problems prior to it. One of them has constant visual snow combined with hallucination like visions, the first year it was a great source of anxiety and depression. now that has settled, but not being able to focus on text and music because of the visual snow and other issues really makes his life not normal.

My other friend also have visual snow and a constant dulling of his mind.

They did not take big doses and never had major problems before this.